feat: FIT-474: Update project membership API to be paginated and searchable by user name or email

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• feat: FIT-474: Update project membership API to be paginated and searchable by user name or email label-studio-sdk#534

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.36%. Comparing base (a49867b) to head (aafc70f).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #8223       +/-   ##
============================================
+ Coverage    35.53%   78.36%   +42.83%     
============================================
  Files          667      216      -451     
  Lines        47661    18055    -29606     
  Branches      7952        0     -7952     
============================================
- Hits         16936    14149     -2787     
+ Misses       30722     3906    -26816     
+ Partials         3        0        -3     

Flag	Coverage Δ
lsf-unit	?
pytests	78.36% <ø> (ø)

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