Add sim state serialization

[jbeirer]

This MR:

• refactors the serialization of ExtrapStateContainer and TrackContainer to inherit from a common base class named Container. The base class is a templated class with two template parameters: ElementType: the type of objects the container holds (e.g. TFCSSimulationState's) and SerializedType: the struct that defines the structure of the serialized data. All daughter classes are required to override the pure virtual method virtual auto flatten() const -> std::vector<SerializedType> = 0; that defines how the data is to be serialized.
• Adds adds a SimulationStateContainer class to hold TFCSSimulationState objects and allows its serialization. Note: Currently, the geometry / cell information does not contain all information that we would like to serialize (for instance whether a cell contains to a barrel layer and in which coordinate system its dimensions are described). This needs to be revisited once we load the geometry using the ROOT file also employed for the simplified geometry.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 97.77778% with 2 lines in your changes missing coverage. Please review.

Project coverage is 31.24%. Comparing base (aa6344a) to head (5139d44).

Files	Patch %	Lines
test/TestHelpers/Container.h	92.30%	1 Missing :warning:
test/TestHelpers/SimStateContainer.h	96.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #20 +/- ## ========================================== + Coverage 31.06% 31.24% +0.18% ========================================== Files 215 217 +2 Lines 11526 11560 +34 Branches 1645 1648 +3 ========================================== + Hits 3580 3612 +32 - Misses 7946 7948 +2 ```

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