build: add clippy lints

[Wodann]

No description provided.

[codecov]

Codecov Report

Attention: 116 lines in your changes are missing coverage. Please review.

Comparison is base (16821fb) 87.20% compared to head (7846f3c) 87.43%.

Files	Patch %	Lines
crates/mun_language_server/src/handlers.rs	71.73%	13 Missing ⚠️
crates/mun_codegen/src/ir/body.rs	84.61%	6 Missing ⚠️
crates/mun_language_server/src/lib.rs	0.00%	6 Missing ⚠️
crates/mun_memory/src/gc/mark_sweep.rs	95.38%	6 Missing ⚠️
crates/mun_hir/src/resolve.rs	83.87%	5 Missing ⚠️
crates/mun_memory/src/type/ffi/struct.rs	44.44%	5 Missing ⚠️
crates/mun_skeptic/src/lib.rs	0.00%	5 Missing ⚠️
crates/mun_hir/src/ty/infer.rs	96.03%	4 Missing ⚠️
crates/mun_hir/src/ty/primitives.rs	60.00%	4 Missing ⚠️
crates/mun_syntax/src/token_text.rs	0.00%	4 Missing ⚠️
... and 41 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #546      +/-   ##
==========================================
+ Coverage   87.20%   87.43%   +0.22%     
==========================================
  Files         269      269              
  Lines       31167    31139      -28     
==========================================
+ Hits        27180    27226      +46     
+ Misses       3987     3913      -74     

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