Refactor CookieCrumble to abstract test frameworks

[stuartjbrown]

Refactor the test framework specific logic / code into their own assemblies in order to avoid polluting the CookieCrumble project with test framework specific references. This means that a small amount of (global) setup is needed before using Snapshot.

• Added an interface ITestFramework to abstract the test framework specific logic
• Added 2 projects with the test framework specific implementation (CookieCrumble.MSTest and CookieCrumble.Xunit)
• Added a test project for MSTest and updated the existing one which uses Xunit

[github-actions]

HotChocolate.Data.Spatial.Filters.QueryableFilterVisitorIntersectsTests.Create_Intersects_Query [FAIL]

[github-actions]

HotChocolate.Execution.Integration.StarWarsCodeFirst.StarWarsCodeFirstTests.TypeNameFieldIsCorrectlyExecutedOnInterfaces [FAIL]

[github-actions]

[FAIL]

[codecov]

Codecov Report

Patch coverage: 57.77% and project coverage change: -0.12% ⚠️

Comparison is base (6965960) 78.98% compared to head (a60783e) 78.87%.
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6537      +/-   ##
==========================================
- Coverage   78.98%   78.87%   -0.12%     
==========================================
  Files        2903     2917      +14     
  Lines      139771   140402     +631     
==========================================
+ Hits       110397   110740     +343     
- Misses      29374    29662     +288     

Flag	Coverage Δ
unittests	78.87% <57.77%> (-0.12%)	⬇️

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Files Changed	Coverage Δ
...ocolate/Fusion/src/Core/Execution/Nodes/Resolve.cs	78.33% <12.50%> (-10.35%)	⬇️
...sion/src/Core/Execution/Nodes/ResolveByKeyBatch.cs	69.30% <12.50%> (-2.34%)	⬇️
...Types/Resolvers/DirectiveClassMiddlewareFactory.cs	62.50% <75.00%> (+44.31%)	⬆️
src/CookieCrumble/src/CookieCrumble/Snapshot.cs	77.74% <80.95%> (ø)
...rc/Core/Metadata/FusionGraphConfigurationReader.cs	94.04% <100.00%> (+0.90%)	⬆️

... and 41 files with indirect coverage changes

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