Merge #5618

Merge #5618

5618: Rename TypeRef -> Type r=matklad a=matklad

The TypeRef name comes from IntelliJ days, where you often have both
type *syntax* as well as *semantical* representation of types in
scope. And naming both Type is confusing.

In rust-analyzer however, we use ast types as `ast::Type`, and have
many more semantic counterparts to ast types, so avoiding name clash
here is just confusing.

bors r+
🤖

Co-authored-by: Aleksey Kladov <aleksey.kladov@gmail.com>