Merge #9321

9321: Inline generics in const and function trait completions r=Veykril a=RDambrosio016

This PR does a couple of things:
- moves path_transform from ide_assists to ide_db to be shared by both assists and completions
- when completing a const or a function for a trait, it will "inline" any generics in those associated items instead 
of leaving the generic's name. For example:
```rust
trait Foo<T> {
    const BAR: T;
    fn foo() -> T;
}
struct Bar;

impl Foo<u32> for Bar {
    // autocompletes to this
    fn foo() -> u32;

    // and not this (old)
    fn foo() -> T;

    // also works for associated consts and where clauses
    const BAR: u32 = /* */
}
```

Currently this does not work for const generics, because `PathTransform` does not seem to account for them. If this should work on const generics too, `PathTransform` will need to be changed. However, it is uncommon to implement a trait only for a single const value, so this isnt a huge concern.

Co-authored-by: rdambrosio <[email protected]>

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