Return summary DTO from current_user endpoint & add new endpoint for detailed user object

[axlewin]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 40.35%. Comparing base (0d11ee4) to head (c73c6b8).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...n/java/uk/ac/cam/cl/dtg/segue/api/UsersFacade.java	0.00%	16 Missing ⚠️
.../cl/dtg/segue/api/managers/UserAccountManager.java	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #788      +/-   ##
==========================================
- Coverage   40.39%   40.35%   -0.04%     
==========================================
  Files         547      547              
  Lines       23722    23742      +20     
  Branches     2882     2884       +2     
==========================================
  Hits         9582     9582              
- Misses      13245    13265      +20     
  Partials      895      895              

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