[Mono] Hot reload: Add support for editing members of generic types

[lambdageek]

CoreCLR issue #11036

This is about modifying or editing methods in a generic class.

A related issue is modifying generic methods in non-generic types #82791

There are potentially two separate streams of work here:

1. Adding/updating methods in generic types
2. Adding static/instance fields in generic types

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.