docs: add more comparisons with similar crates

[loichyan]

As suggested here, this PR adds some comparisons with dynosaur and adds an example of how to use bitte for thread-safe async traits.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.37%. Comparing base (001400d) to head (69474ec).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #16   +/-   ##
=======================================
  Coverage   98.37%   98.37%           
=======================================
  Files          12       12           
  Lines         862      862           
=======================================
  Hits          848      848           
  Misses         14       14           

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