store large responses with gridfs; drop dehydrated

[tokebe]

Also cleans up orphaned gridfs parts periodically

[codecov]

Codecov Report

❌ Patch coverage is 25.20325% with 92 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/retriever/utils/mongo.py	25.74%	75 Missing ⚠️
src/retriever/utils/orphan_detection.py	9.09%	10 Missing ⚠️
src/retriever/lookup/lookup.py	12.50%	7 Missing ⚠️

Files with missing lines	Coverage Δ
src/retriever/config/general.py	96.24% <100.00%> (+0.05%)	⬆️
src/retriever/query.py	60.71% <100.00%> (ø)
src/retriever/lookup/lookup.py	21.80% <12.50%> (-0.72%)	⬇️
src/retriever/utils/orphan_detection.py	54.68% <9.09%> (-9.47%)	⬇️
src/retriever/utils/mongo.py	36.24% <25.74%> (-1.94%)	⬇️

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