Add a cargo deny configuration

[poljar]

This allows us to use a single tool to check for security issues as well as licensing issues and that we don't have any git dependencies.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.55%. Comparing base (72f4235) to head (23ab241).
Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #169   +/-   ##
=======================================
  Coverage   90.55%   90.55%           
=======================================
  Files          34       34           
  Lines        1906     1906           
=======================================
  Hits         1726     1726           
  Misses        180      180           

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[dkasak]

Looks good modulo a nit.