[backend] docs(queryable): add javadoc on queryable annotation (#1)

[RomuDeuxfois]

No description provided.

[RomuDeuxfois]

@antoinemzs I’m adding Javadoc to the @Queryable annotation for clarity.
Could you also add Javadoc for the properties you introduced when improving this annotation?
Thanks!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.52%. Comparing base (0ebd2de) to head (4697bca).
⚠️ Report is 1 commits behind head on release/current.

Additional details and impacted files

@@                  Coverage Diff                  @@
##             release/current    #4466      +/-   ##
=====================================================
+ Coverage              50.11%   50.52%   +0.40%     
- Complexity              3636     3696      +60     
=====================================================
  Files                    896      896              
  Lines                  26560    26911     +351     
  Branches                1989     2033      +44     
=====================================================
+ Hits                   13311    13597     +286     
- Misses                 12450    12499      +49     
- Partials                 799      815      +16     

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