Add comments for ScenarioStateStore related code

[StefH]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 53.57143% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 36.61%. Comparing base (070e4b6) to head (f2b03cf).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...et.Minimal/Handlers/FileBasedScenarioStateStore.cs	50.00%	5 Missing ⚠️
....Net.Shared/Handlers/InMemoryScenarioStateStore.cs	63.63%	4 Missing ⚠️
...Mock.Net.Shared/Settings/WireMockServerSettings.cs	42.85%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1433      +/-   ##
==========================================
+ Coverage   36.29%   36.61%   +0.31%     
==========================================
  Files         157      157              
  Lines       39925    38385    -1540     
==========================================
- Hits        14490    14053     -437     
+ Misses      24857    23800    -1057     
+ Partials      578      532      -46     

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