3108: Magic Completion for `impl Trait for` Associated Items r=matklad a=kdelorey
# Summary
This PR adds a set of magic completions to auto complete associated trait items (functions/consts/types).
## Notes
Since the assist and completion share the same logic when figuring out the associated items that are missing, a shared utility was created in the `ra_assists::utils` module.
Resolves#1046
As this is my first PR to the rust-analyzer project, I'm new to the codebase, feedback welcomed!
Co-authored-by: Kevin DeLorey <2295721+kdelorey@users.noreply.github.com>
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