add keyword argument encode_url for ClientSession._request

[RomySaputraSihananda]

Hello Dev Team,

I have implemented a new feature enhancement in the ClientSession._fetch method. This enhancement introduces an optional parameter named encode_url, which allows users to control whether the URL should be encoded before being used in the HTTP request. Below are the technical details:

1. Changes: Added the optional parameter encode_url to the ClientSession._fetch method.
2. Implementation: I added conditional logic where the URL encoding is performed based on the value of encode_url.
3. Testing: I have included unit tests to ensure that this feature works as expected in various scenarios.
   I believe that this feature will enhance the flexibility and usability of aiohttp in cases where direct control over URL encoding is necessary. I am open to addressing any feedback or changes required before merging.

Thank you for your time and consideration.

Best regards,

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.57%. Comparing base (fc32f69) to head (b85d50e).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8466      +/-   ##
==========================================
- Coverage   97.64%   97.57%   -0.07%     
==========================================
  Files         107      107              
  Lines       33067    33067              
  Branches     3885     3885              
==========================================
- Hits        32288    32266      -22     
- Misses        562      580      +18     
- Partials      217      221       +4     

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OS-Windows	95.64% <ø> (ø)
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Py-3.10.11	97.03% <100.00%> (ø)
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Py-3.9.13	97.02% <100.00%> (+<0.01%)	⬆️
Py-3.9.19	96.97% <100.00%> (ø)
Py-pypy7.3.16	?
VM-macos	96.88% <100.00%> (ø)
VM-ubuntu	97.16% <100.00%> (-0.06%)	⬇️
VM-windows	95.64% <ø> (ø)

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[Dreamsorcerer]

I think this is just duplicating the URL object, so not sure it makes much difference to the user:

.get(url, encode_url=False) vs .get(URL(url, encoded=True))

We get enough bug reports from users that I'm thinking we should change the default in future though. @webknjaz What do you think about disabling the encoding option by default in v4?