♻️ reorganize library structure

[burgholzer]

Description

This PR cleans up the library structure within MQT Core. It separates the library into smaller CMake targets that are each configured in their own subdirectory. Most notably, this implies the following changes:

• MQT::Core -> MQT::CoreIR, MQT::CoreAlgo, MQT::CoreCircuitOptimizer
• Disentangle the circuit optimizer from the QuantumComputation class and only rely on the public API
• Separation of the circuit optimizer tests from the main IR tests
• Each library target now has its own export header
• The GRCS class and parser have been removed as they were not really used
• Moved the Grover specialization for building its functionality to the Benchmark part of the library
• Moved the reorderOperations method from the CircuitOptimizer to the QuantumComputation class to keep the MQT::CoreIR target self-contained.
• Refactors the mqt.core Python package. Removes a level of indirection by directly exposing the bindings module as mqt.core.ir

[!CAUTION] This is a breaking change for consuming libraries. Any library relying on MQT Core will have to adapt accordingly.

Checklist:

• [x] The pull request only contains commits that are related to it.
• [x] I have added appropriate tests and documentation.
• [x] I have made sure that all CI jobs on GitHub pass.
• [x] The pull request introduces no new warnings and follows the project's style guidelines.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 98.59813% with 3 lines in your changes missing coverage. Please review.

Project coverage is 92.0%. Comparing base (9ddee9e) to head (f490b00).

Files	Patch %	Lines
src/circuit_optimizer/CircuitOptimizer.cpp	95.8%	3 Missing :warning:

Additional details and impacted files

[](https://app.codecov.io/gh/cda-tum/mqt-core/pull/668?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cda-tum) ```diff @@ Coverage Diff @@ ## main #668 +/- ## ======================================= + Coverage 91.7% 92.0% +0.3% ======================================= Files 133 127 -6 Lines 14106 13912 -194 Branches 2212 2177 -35 ======================================= - Hits 12945 12811 -134 + Misses 1161 1101 -60 ``` | [Flag](https://app.codecov.io/gh/cda-tum/mqt-core/pull/668/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cda-tum) | Coverage Δ | | |---|---|---| | [cpp](https://app.codecov.io/gh/cda-tum/mqt-core/pull/668/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cda-tum) | `91.8% <98.4%> (+0.3%)` | :arrow_up: | | [python](https://app.codecov.io/gh/cda-tum/mqt-core/pull/668/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cda-tum) | `99.7% <100.0%> (-0.1%)` | :arrow_down: | | [Files](https://app.codecov.io/gh/cda-tum/mqt-core/pull/668?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cda-tum) | Coverage Δ | | |---|---|---| | [include/mqt-core/Definitions.hpp](https://app.codecov.io/gh/cda-tum/mqt-core/pull/668?src=pr&el=tree&filepath=include%2Fmqt-core%2FDefinitions.hpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cda-tum#diff-aW5jbHVkZS9tcXQtY29yZS9EZWZpbml0aW9ucy5ocHA=) | `76.4% <ø> (ø)` | | | [include/mqt-core/datastructures/Layer.hpp](https://app.codecov.io/gh/cda-tum/mqt-core/pull/668?src=pr&el=tree&filepath=include%2Fmqt-core%2Fdatastructures%2FLayer.hpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cda-tum#diff-aW5jbHVkZS9tcXQtY29yZS9kYXRhc3RydWN0dXJlcy9MYXllci5ocHA=) | `89.3% <ø> (ø)` | | | [include/mqt-core/dd/FunctionalityConstruction.hpp](https://app.codecov.io/gh/cda-tum/mqt-core/pull/668?src=pr&el=tree&filepath=include%2Fmqt-core%2Fdd%2FFunctionalityConstruction.hpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cda-tum#diff-aW5jbHVkZS9tcXQtY29yZS9kZC9GdW5jdGlvbmFsaXR5Q29uc3RydWN0aW9uLmhwcA==) | `100.0% <ø> (ø)` | | | [include/mqt-core/dd/NoiseFunctionality.hpp](https://app.codecov.io/gh/cda-tum/mqt-core/pull/668?src=pr&el=tree&filepath=include%2Fmqt-core%2Fdd%2FNoiseFunctionality.hpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cda-tum#diff-aW5jbHVkZS9tcXQtY29yZS9kZC9Ob2lzZUZ1bmN0aW9uYWxpdHkuaHBw) | `100.0% <ø> (ø)` | | | [include/mqt-core/dd/Operations.hpp](https://app.codecov.io/gh/cda-tum/mqt-core/pull/668?src=pr&el=tree&filepath=include%2Fmqt-core%2Fdd%2FOperations.hpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cda-tum#diff-aW5jbHVkZS9tcXQtY29yZS9kZC9PcGVyYXRpb25zLmhwcA==) | `88.6% <ø> (ø)` | | | [include/mqt-core/dd/Package.hpp](https://app.codecov.io/gh/cda-tum/mqt-core/pull/668?src=pr&el=tree&filepath=include%2Fmqt-core%2Fdd%2FPackage.hpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cda-tum#diff-aW5jbHVkZS9tcXQtY29yZS9kZC9QYWNrYWdlLmhwcA==) | `97.0% <ø> (-0.2%)` | :arrow_down: | | [include/mqt-core/dd/Simulation.hpp](https://app.codecov.io/gh/cda-tum/mqt-core/pull/668?src=pr&el=tree&filepath=include%2Fmqt-core%2Fdd%2FSimulation.hpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cda-tum#diff-aW5jbHVkZS9tcXQtY29yZS9kZC9TaW11bGF0aW9uLmhwcA==) | `100.0% <ø> (ø)` | | | [include/mqt-core/ir/Permutation.hpp](https://app.codecov.io/gh/cda-tum/mqt-core/pull/668?src=pr&el=tree&filepath=include%2Fmqt-core%2Fir%2FPermutation.hpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cda-tum#diff-aW5jbHVkZS9tcXQtY29yZS9pci9QZXJtdXRhdGlvbi5ocHA=) | `100.0% <ø> (ø)` | | | [include/mqt-core/ir/QuantumComputation.hpp](https://app.codecov.io/gh/cda-tum/mqt-core/pull/668?src=pr&el=tree&filepath=include%2Fmqt-core%2Fir%2FQuantumComputation.hpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cda-tum#diff-aW5jbHVkZS9tcXQtY29yZS9pci9RdWFudHVtQ29tcHV0YXRpb24uaHBw) | `92.4% <ø> (ø)` | | | [include/mqt-core/ir/operations/AodOperation.hpp](https://app.codecov.io/gh/cda-tum/mqt-core/pull/668?src=pr&el=tree&filepath=include%2Fmqt-core%2Fir%2Foperations%2FAodOperation.hpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cda-tum#diff-aW5jbHVkZS9tcXQtY29yZS9pci9vcGVyYXRpb25zL0FvZE9wZXJhdGlvbi5ocHA=) | `91.6% <ø> (ø)` | | | ... and [68 more](https://app.codecov.io/gh/cda-tum/mqt-core/pull/668?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cda-tum) | | ... and [1 file with indirect coverage 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