Support More Syntax Locations for `AddRockAttributeRefactoring`

[JasonBock]

Describe the solution you'd like
I just noticed that the refactoring doesn't come up if you're on a base type definition. For example, if my cursor is on BaseClass:

public class DerivedClass
  : BaseClass { }

I don't get the refactoring option (I do if the cursor is on DerivedClass, which is expected). The refactoring should be offered on BaseClass. Note that if BaseClass is an interface, it works.

May want to keep track of where the refactoring isn't offered and build the list here.

[JasonBock]

As I found out when I was streaming the fix, there may be other places to look at that aren't hit by the current type searches. IdenitiferNameSyntax should cover the majority, but as I found, like with PredefinedTypeSyntax, there are exceptional cases. May want to also look at:

• Named tuple members
• Switch statements and/or expressions
• Pattern matching
• And maybe others...

Again, IdentifierNameSyntax should cover most, but if there are others, let's Pokemon them (gotta catch 'em all).