chore: use Self where appropriate

[arendjr]

Summary

Follow-up on #5533 . Updated crates annotations to enforce the use of Self, and updated part of the codegen/made some exclusions for the rest.

Thanks to @adamnemecek for the suggestion and the reference to start on this.

Test Plan

CI should remain green.

[ematipico]

@arendjr if possible, can you cherry-pick @adamnemecek 's commit, so they will appear in the commit history as a contributor?

[arendjr]

I didn't do a cherry-pick to avoid the merge errors, but I've amended the commit with a Co-authored-by line, so now we both show up :)

[codspeed-hq]

CodSpeed Performance Report

Merging #5699 will not alter performance

_{Comparing arendjr:use-self (d2842c5) with main (f3c34de)}

Summary

✅ 95 untouched benchmarks