New API endpoint for listing users

[mario-nt]

Parent issue #658

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.

Project coverage is 48.78%. Comparing base (2de8313) to head (02d233d).
Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/databases/mysql.rs	0.00%	7 Missing ⚠️
src/databases/sqlite.rs	0.00%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #788      +/-   ##
===========================================
+ Coverage    47.96%   48.78%   +0.81%     
===========================================
  Files          120      111       -9     
  Lines         8443     8300     -143     
  Branches      8443     8300     -143     
===========================================
- Hits          4050     4049       -1     
+ Misses        4220     4113     -107     
+ Partials       173      138      -35     

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