Add ATLAS particle extrapolation and simulation tests

[jbeirer]

This pull request

• introduces the FastCaloSimCalo extrapolation that performs the extrapolation to the ID-calo boundary and the layers of the calorimeter. This is the last missing part to allow a realistic ATLAS simulation.
• Introduces tests / plotting for the extrapolation as well as basic test for the simulation
• Quite significant test refactoring to make things more organized. Tests are separated into source, include and TestConfig directories. Important convention: Tests that make available static objects to the tests should be declared at the bottom of the header files. Tests that depend on other tests, need to inherit from them and explicitly call their SetUpTestSuite() and TearDownTestSuite() methods.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 86.56174% with 111 lines in your changes missing coverage. Please review.

Project coverage is 31.06%. Comparing base (3a51aec) to head (138d607).

Files	Patch %	Lines
...rce/Extrapolation/FastCaloSimCaloExtrapolation.cxx	81.04%	87 Missing :warning:
test/g4app/src/FastSimModel.cc	59.52%	17 Missing :warning:
test/source/BasicExtrapolTests.cxx	94.44%	3 Missing :warning:
...loSim/Extrapolation/FastCaloSimCaloExtrapolation.h	71.42%	2 Missing :warning:
test/TestHelpers/Event.h	66.66%	1 Missing :warning:
test/source/AtlasTransportTests.cxx	96.55%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #19 +/- ## ========================================== + Coverage 27.25% 31.06% +3.80% ========================================== Files 198 215 +17 Lines 10852 11526 +674 Branches 1586 1645 +59 ========================================== + Hits 2958 3580 +622 - Misses 7894 7946 +52 ```

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