[unsafe-fields] Add Cargo.toml description

[joshlf]

Makes progress on #1931

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This PR is on branch unsafe-fields-cargo-toml.

• [unsafe-fields] Add Cargo.toml description #1959

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.46%. Comparing base (986e3c5) to head (fa80bcf).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1959   +/-   ##
=======================================
  Coverage   89.46%   89.46%           
=======================================
  Files          16       16           
  Lines        5838     5838           
=======================================
  Hits         5223     5223           
  Misses        615      615           

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