Migrate fxhash to rustc-hash

[jackye1995]

Fixes #134

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.34%. Comparing base (12fb018) to head (576ec94).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #135   +/-   ##
=======================================
  Coverage   83.34%   83.34%           
=======================================
  Files           9        9           
  Lines        1759     1759           
=======================================
  Hits         1466     1466           
  Misses        293      293           

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[codspeed-hq]

CodSpeed Performance Report

Merging #135 will not alter performance

_{Comparing jackye1995:fxhash-remove (576ec94) with main (12fb018)}

Summary

✅ 12 untouched benchmarks

[messense]

Thanks!