Annotation create POST api

[naknomum]

POST /api/v3/annotations to create a new Annotation.

PR fixes #920

required (valid) values in payload:

• mediaAssetId
• x, y, width, height (theta is optional; will be 0 if not given)
• iaClass
• viewpoint
• encounterId

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 185 lines in your changes missing coverage. Please review.

Project coverage is 0.14%. Comparing base (fbac158) to head (f6cad3b).

Files with missing lines	Patch %	Lines
src/main/java/org/ecocean/Annotation.java	0.00%	162 Missing ⚠️
src/main/java/org/ecocean/api/BaseObject.java	0.00%	23 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              main    #980      +/-   ##
==========================================
- Coverage     0.14%   0.14%   -0.01%     
  Complexity      29      29              
==========================================
  Files          565     565              
  Lines        63188   63363     +175     
  Branches     10947   10982      +35     
==========================================
  Hits            89      89              
- Misses       63080   63255     +175     
  Partials        19      19              

Flag	Coverage Δ
backend	0.14% <0.00%> (-0.01%)	⬇️
frontend	0.14% <0.00%> (-0.01%)	⬇️

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[erinz2020]

looks good to me