Merge #6670

6670: Allow renaming between self and first param with owned parameters r=matklad a=Veykril

This fixes renaming owned SelfParams turning the parameter into a reference, as in, for a type `Foo`, `fn foo(self) {}` became `fn foo(renamed_name: &Foo) {}` prior to this.

Similarly for the other way around, we now support renaming non-ref parameters to `self`. Additionally we do more checks now than before. We check:
- that the function has an impl block
- that we are renaming the first parameter(prior we ignored which parameter was renamed and always picked the first nevertheless)
- that the parameter's type aligns with the impl block(minus one level of reference abstraction to account for `&self`/`&mut self`)

Co-authored-by: Lukas Wirth <[email protected]>

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