Make all warnings across crates and binaries consistent

[bluejekyll]

@leshow, Here's that PR. This makes all warnings across the crates consistent. I adopted most of your recommendations, except for the Debug one. That would have been really messy because there are a lot of external types that are not themselves Debug.

We can merge this after your PR, since it has the overlap on Copy in the proto crate

depends on: #1397

[codecov]

Codecov Report

Merging #1401 (603a3ad) into main (a44d441) will increase coverage by 0.03%.
The diff coverage is 78.02%.

@@            Coverage Diff             @@
##             main    #1401      +/-   ##
==========================================
+ Coverage   85.16%   85.19%   +0.03%     
==========================================
  Files         153      152       -1     
  Lines       15038    14958      -80     
==========================================
- Hits        12806    12743      -63     
+ Misses       2232     2215      -17     

[leshow]

Looks good to me!