fix: update metrics proto and metric transformation.

[TommyCpp]

• Removed all IntXXX objects as they will be removed in coming months and are currently deprecated.
• Updated Grpcio generated files.

[codecov]

Codecov Report

Merging #535 (395c05e) into main (3ff1802) will not change coverage.
The diff coverage is n/a.

❗ Current head 395c05e differs from pull request most recent head baca05f. Consider uploading reports for the commit baca05f to get more accurate results

@@          Coverage Diff          @@
##            main    #535   +/-   ##
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  Coverage   52.2%   52.2%           
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  Files         96      96           
  Lines       8513    8513           
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  Hits        4451    4451           
  Misses      4062    4062           

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[djc]

Most of the changes look good to me, maybe some discussion about the precommit hook change is warranted (it doesn't seem to really fit in with this PR).