doc: Added documentation for 5 Collection APIs

[Jagrutiti]

What

Added documentation for the following APIs:

1. /api/v1/predictions/ PredictionCollection()
2. /api/v1/images/prediction/collection ImagePredictionCollection()
3. /api/v1/images ImageCollection
4. /api/v1/annotation/collection LogoAnnotationCollection
5. /api/v1/questions/unanswered/ UnansweredQuestionCollection

Part of

• Display insight / predictions etc for a product or a particular filter #618

Closes

• Add documentation for new API (unanswered questions and collections api) #896

[alexgarel]

Some suggestions :-)

I let you merge afterwards.

[codecov]

Codecov Report

Merging #898 (9d869c1) into master (1e63ca2) will increase coverage by 7.92%.
The diff coverage is 75.18%.

@@            Coverage Diff             @@
##           master     #898      +/-   ##
==========================================
+ Coverage   44.73%   52.65%   +7.92%     
==========================================
  Files          96       92       -4     
  Lines        6981     7015      +34     
==========================================
+ Hits         3123     3694     +571     
+ Misses       3858     3321     -537     

Impacted Files	Coverage Δ
robotoff/cli/batch.py	0.00% <ø> (ø)
robotoff/cli/insights.py	0.00% <0.00%> (ø)
robotoff/insights/dataclass.py	100.00% <ø> (ø)
robotoff/prediction/ocr/brand.py	68.62% <0.00%> (ø)
robotoff/prediction/ocr/expiration_date.py	25.71% <ø> (ø)
robotoff/prediction/ocr/image_flag.py	41.02% <ø> (ø)
robotoff/prediction/ocr/label.py	72.30% <0.00%> (ø)
robotoff/prediction/ocr/packager_code.py	73.07% <ø> (ø)
robotoff/prediction/ocr/product_weight.py	49.10% <0.00%> (+1.28%)	⬆️
robotoff/products.py	42.75% <ø> (+2.26%)	⬆️
... and 61 more

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
6 Security Hotspots
115 Code Smells

0.0% Coverage
0.1% Duplication

[alexgarel]

Thanks @Jagrutiti :-)