Exported classes with explicit interface implementations

[ArcadeMode]

string MyInterface.MyProperty { get; set; } or string MyInterface.MyMethod() { return "sahdude" } cannot be referenced as members. This likely conflicts with the current implementation This does not cause issues with codegen, it just wont output. The user might like to know so an analyzer rule wouldnt hurt.

• ensure codegen fails to avoid obscure compilation errors for user
• add info diagnostic to analyzer: explicit interface implementations are not included in codegen

[ArcadeMode]

Not a real issue, just not included in codegen. no prio for now.