Minor work items left for CSharpToLinqTranslator

[roji]

• Review whether more calls of ResolveType() should be done while supplying a genericParameterMap. For example, the expression could be referencing a generic type parameter from the containing type.
• Add tests for anonymous type, different closures, nested generics, indexers, records with.
• Add up-cast when a hidden member is accessed/invoked (see Implement precompiled queries #33297 (comment))
• Check binary UnsignedRightShiftExpression
• Separate out EF Core-specific logic (EF Core would extend this visitor)
• We match Roslyn type parameters by name, not sure that's right; also for the method's generic type parameters
• Test invoking extension without extension syntax (as static)
• Multiple overloads of Add() when translating list initializers
• Dictionary initializer, where each ElementInit has more than one expression
• Cache closed anonymous types
• ArrayCreation: multi-dimensional array
• ElementAccessExpressionSyntax over non-array
• DbSet local symbol