Add force_cache extension

[karpetrosyan]

Ref: #116

This pull request adds the force_cache extension, which can be included in the request to tell the controller that for this particular request you want to disable all the caching rules, enforcing the client to always cache that response.

This can be useful when you just want to cache the response for some time, using the power of Hishel's storage, whatever response is cacheable or not.

Example:

import hishel

client = hishel.CacheClient(storage=hishel.SQLiteStorage(ttl=3600))
response = client.get("https://www.example.com/uncachable-endpoint", extensions={"ignore_rules": True})

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (dd33b20) 100.00% compared to head (d34179a) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #117   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           27        27           
  Lines         1747      1769   +22     
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+ Hits          1747      1769   +22     

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[parkerhancock]

Hey! Running this by you before I merge. Code looks great, no functional changes. But I think it would be clearer what this is doing if we call it "force_cache" rather than "ignore_rules," since it isn't clear what rules we are ignoring. Let me know if you object to that, otherwise this is good to go!

[karpetrosyan]

Hey @parkerhancock! Yes, force_cache makes more sense, thank you!

I guess we are ready to merge this