Cookie support for automap

[Gallaecio]

To-do:

• Handle TODO comments.
• Separate cookie parsing and formatting into a separate module that could eventually serve as a starting point for Improve cookie handling scrapy/scrapy#5431
• Agree on the best way to handle max cookies.
• Should we provide a workaround for Setting a cookie for a different domain does not work scrapy/scrapy#5841? Push for an upstream fix? Let things be for now?

[codecov]

Codecov Report

Merging #69 (7d49ce8) into main (fc3a527) will decrease coverage by 0.60%.
The diff coverage is 97.38%.

❗ Current head 7d49ce8 differs from pull request most recent head 6ffb124. Consider uploading reports for the commit 6ffb124 to get more accurate results

@@            Coverage Diff             @@
##             main      #69      +/-   ##
==========================================
- Coverage   99.54%   98.94%   -0.60%     
==========================================
  Files           7        8       +1     
  Lines         435      571     +136     
==========================================
+ Hits          433      565     +132     
- Misses          2        6       +4     

Impacted Files	Coverage Δ
scrapy_zyte_api/handler.py	97.88% <90.00%> (-1.32%)	⬇️
scrapy_zyte_api/_cookies.py	96.00% <96.00%> (ø)
scrapy_zyte_api/responses.py	98.92% <97.22%> (-1.08%)	⬇️
scrapy_zyte_api/_downloader_middleware.py	100.00% <100.00%> (ø)
scrapy_zyte_api/_params.py	100.00% <100.00%> (ø)
scrapy_zyte_api/_request_fingerprinter.py	97.36% <100.00%> (ø)

[kmike]

Thanks @Gallaecio! I've checked all the changes, and can't spot any issue 👍 This is a complex feature, so we both might be missing something, but it'd be found in a real-world usage. So, let's proceed. Great work!