fix: allow to filter insights by campaign

[raphael0202]

Add a new campaigns filter to /api/v1/insights route.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 54.56%. Comparing base (20fd107) to head (f31cebd).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
robotoff/app/api.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1477      +/-   ##
==========================================
- Coverage   54.56%   54.56%   -0.01%     
==========================================
  Files          85       85              
  Lines        8714     8715       +1     
==========================================
  Hits         4755     4755              
- Misses       3959     3960       +1     

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