Changes Required for DD Reordering to Minimize Runtime

[Claudiaaaaaaaaa]

Description

The running time of DDs depends on the order of the nodes in the diagram. In the package DDsim we implement a tool that tries to find the optimal or near-optimal order of nodes resulting in the minimal running time. All changes required in MQT-core are contained in this PR.

Checklist:

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

[burgholzer]

I suppose this is no longer needed, given the proposed alternative is viable. Feel free to reopen, if this is still needed.