Add ETags to api responses

[tlambert03]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 83.12500% with 27 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.89%. Comparing base (7b1479f) to head (bdaa860).

Files with missing lines	Patch %	Lines
backend/fpbase/etag_utils.py	55.26%	17 Missing ⚠️
backend/fpbase/cache_utils.py	92.00%	4 Missing ⚠️
backend/fpbase/decorators.py	78.57%	3 Missing ⚠️
backend/proteins/api/views.py	77.77%	2 Missing ⚠️
backend/fpbase/api_mixins.py	90.90%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (7b1479f) and HEAD (bdaa860). Click for more details.

HEAD has 3 uploads less than BASE

Flag	BASE (7b1479f)	HEAD (bdaa860)
	4	1

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #372      +/-   ##
==========================================
- Coverage   60.70%   51.89%   -8.81%     
==========================================
  Files         107      110       +3     
  Lines        8649     8800     +151     
==========================================
- Hits         5250     4567     -683     
- Misses       3399     4233     +834     

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