Support discarding requests from user code

[AdrianAtZyte]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.09%. Comparing base (1701567) to head (b4ccc8b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #312      +/-   ##
==========================================
+ Coverage   97.50%   98.09%   +0.59%     
==========================================
  Files          15       15              
  Lines        2404     2472      +68     
  Branches      439      453      +14     
==========================================
+ Hits         2344     2425      +81     
+ Misses         31       20      -11     
+ Partials       29       27       -2     

Files with missing lines	Coverage Δ
scrapy_zyte_api/__init__.py	100.00% <ø> (ø)
scrapy_zyte_api/_request_fingerprinter.py	99.40% <100.00%> (+3.40%)	⬆️
scrapy_zyte_api/_serialization.py	100.00% <100.00%> (ø)
scrapy_zyte_api/_session.py	99.56% <100.00%> (+0.03%)	⬆️
scrapy_zyte_api/addon.py	95.83% <100.00%> (+0.08%)	⬆️
scrapy_zyte_api/providers.py	97.32% <100.00%> (+2.03%)	⬆️
scrapy_zyte_api/utils.py	92.00% <100.00%> (+0.54%)	⬆️

... and 1 file with indirect coverage changes

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