[mono] Tracking: covariant return methods support · dotnet/runtime#37509

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This is a tracking issue for the implementation of Covariant Return Methods Mono

pass test cases for variant interfaces CovariantReturns/Interfaces/UnitTest.il and UnsupportedScenario1.il, UnsupportedScenario2.il and UnsupportedScenario3.il
Implement PreserveBaseBaseOverrideAttribute support for SRE images

Implement PreserveBaseOverrideAttribute PR: -> passing AttributeTesting.il, UnitTest.il and OverrideMoreDerivedReturn.il
Pass "positive" covariant returns unit tests (ie we set up the vtable correctly and callvirt calls the right method) PR https://github.com/dotnet/runtime/pull/37516 - Passing everythign in UnitTest except UnitTest_GVM.il
Pass "negative" unit tests (ie we throw the correct exception for unsupported scenarios or incorrect overrides)

Research direction: Study the Mono runtime's vtable implementation and understand how covariant return methods are supported in CoreCLR, then explore how to adapt the same tests for Mono.
Tech stack: csharp
Domain: backend
Issue type: Feature
Difficulty: 4
Estimated time: Over 1 week
Activity status: Active
Clarity: Clear
Prerequisites: C#MonoGit
Newbie friendliness: 20