Implement more APIs in new TypeBuilder, fix bugs found during testing

[buyaa-n]

• Added implementation for DefineMethodOverrideCore(...), GetInterfaceMap(...), GetMethods(...), GetMethodImpl(...), IsAssignableFrom(...) overrides and a few other related APIs
  • Mainly followed scenarios from runtime implementation, added corresponding tests (a few IL level things not testable)
  • In runtime implementation validations related to DefineMethodOverrideCore(...) was happening during type creation, moved the validations to the corresponding API call and throwing ArgumentException instead of TypeLoadException
• Added validations on CreateType() for not implemented methods, methods not having IL when supposed to or having IL when not supposed to have etc.
• Always set MethodAttributes.RTSpecialName for constructors (in addition to MethodAttributes.SpecialName)
• Imported AssemblyBuilderB.Save test from mono and fixed bugs found
  • Corrected logic for getting SignatureCallingConvention of a method
  • Fixed bug found with MarshalAsAttribute attribute with UnmanagedType.CustomMarshaler field type
  • Bug found with writing nested type

Contributes to #92975

[ghost]

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Issue Details

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• Added implementation for DefineMethodOverrideCore(...), GetInterfaceMap(), IsAssignableFrom(...) overrides and a few other related APIs
  • Mainly followed scenarios from runtime implementation
  • In runtime implementation validations related to DefineMethodOverrideCore(...) was happening during type creation, moved the validations to the corresponding API call and throwing ArgumentException instead of TypeLoadException
• Imported AB.Save test from mono and fixed bugs found

Author:	buyaa-n
Assignees:	-
Labels:	area-System.Reflection.Emit
Milestone:	-

[buyaa-n]

Build failure unrelated and reported