fix simple remapper annotation attribute owner

the docs for SimpleRemapper say it's internalName.attributeName but it's actually Ldescriptor;.attributeName for annotations

it also can't remap Enum values in annotations

So this MR fixes that and adds tests for it.

enum values need their own method because they are actually constructed with Enum.valueOf and so need to match the string value of the enum value, not the actual field name. this is useful when remapping a reference to an enum to a completely different enum. since in that case, the values may be different and so need to be transformed.