Adding Moderator view with user_details endpoint

[yattias]

Adding user_details endpoint as well as a moderation view to power moderation section in profile page

related: ResearchHub/researchhub-web#1859

[codecov]

Codecov Report

Attention: Patch coverage is 93.10345% with 2 lines in your changes missing coverage. Please review.

Project coverage is 67.76%. Comparing base (81a7779) to head (51937ac).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
src/user/permissions.py	50.00%	1 Missing ⚠️
src/user/serializers.py	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1914      +/-   ##
==========================================
+ Coverage   67.74%   67.76%   +0.02%     
==========================================
  Files        1149     1150       +1     
  Lines       27381    27406      +25     
==========================================
+ Hits        18549    18572      +23     
- Misses       8832     8834       +2     

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud