Merge #1251

1251: Chalk integration improvements r=matklad a=flodiebold

A few improvements that came up while working on where clause support:
 - turn `implements` into a query again to improve performance
 - allow skipping to a specific function with `analysis-stats`, e.g. `ra_cli analysis-stats --only world_symbols`
 - deduplicate impls in impls_for_trait -- previously many impls e.g. from std where repeated many times, this should help performance as well...
 - add a `HirDisplay` implementation for TraitRef (not used here anywhere, but useful for debugging)

Co-authored-by: Florian Diebold <[email protected]>

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