feat: method resolution

[baszalmstra]

Adds methods to perform method resolution for impl blocks. Also implements hir::Display for a number of types because they are used in snapshot tests.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 86.06061% with 46 lines in your changes are missing coverage. Please review.

Project coverage is 86.57%. Comparing base (b68a952) to head (d3c5ba6). Report is 3 commits behind head on main.

Files	Patch %	Lines
crates/mun_hir/src/display.rs	65.27%	25 Missing :warning:
crates/mun_hir/src/path.rs	50.00%	12 Missing :warning:
crates/mun_hir/src/visibility.rs	42.85%	4 Missing :warning:
crates/mun_hir/src/method_resolution.rs	98.56%	3 Missing :warning:
crates/mun_hir/src/code_model/function.rs	91.66%	1 Missing :warning:
crates/mun_hir/src/name.rs	80.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #561 +/- ## ========================================== - Coverage 87.30% 86.57% -0.74% ========================================== Files 276 274 -2 Lines 32035 32348 +313 ========================================== + Hits 27968 28005 +37 - Misses 4067 4343 +276 ```

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[baszalmstra]

The CI seems to be failing because of an issue when uploading to codecov.

[Wodann]

Thanks for this! This makes my changes simpler too 😃