Support absolute url to override base url

[vivodi]

What do these changes do?

Support absolute url in request to override base url in session.

session = ClientSession(base_url="http://example.com/foo/")

await session.request("GET", "http://abc.com/bar/")

Are there changes in behavior for the user?

Yes

Is it a substantial burden for the maintainers to support this?

No

Related issue number

Fixes #10027

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• If you provide code modification, please add yourself to CONTRIBUTORS.txt
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  • Please keep alphabetical order, the file is sorted by names.
• Add a new news fragment into the CHANGES/ folder

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  • if you don't have an issue number, change it to the pull request
    number after creating the PR

    • .bugfix: A bug fix for something the maintainers deemed an
      improper undesired behavior that got corrected to match
      pre-agreed expectations.
    • .feature: A new behavior, public APIs. That sort of stuff.
    • .deprecation: A declaration of future API removals and breaking
      changes in behavior.
    • .breaking: When something public is removed in a breaking way.
      Could be deprecated in an earlier release.
    • .doc: Notable updates to the documentation structure or build
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    • .contrib: Stuff that affects the contributor experience. e.g.
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    • .misc: Changes that are hard to assign to any of the above
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  • Make sure to use full sentences with correct case and punctuation,
    for example:

    Fixed issue with non-ascii contents in doctest text files
    -- by :user:`contributor-gh-handle`.

    Use the past tense or the present tense a non-imperative mood,
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[codspeed-hq]

CodSpeed Performance Report

Merging #10074 will not alter performance

_{Comparing vivodi:patch-1 (1b560f2) with master (1fa237f)}

Summary

✅ 44 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.76%. Comparing base (1fa237f) to head (1b560f2).
Report is 15 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10074      +/-   ##
==========================================
- Coverage   98.76%   98.76%   -0.01%     
==========================================
  Files         121      121              
  Lines       36860    36859       -1     
  Branches     4396     4396              
==========================================
- Hits        36403    36402       -1     
  Misses        311      311              
  Partials      146      146              

Flag	Coverage Δ
CI-GHA	98.64% <100.00%> (-0.01%)	⬇️
OS-Linux	98.33% <100.00%> (-0.01%)	⬇️
OS-Windows	96.18% <ø> (ø)
OS-macOS	97.44% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	97.29% <100.00%> (-0.01%)	⬇️
Py-3.10.15	97.82% <100.00%> (-0.06%)	⬇️
Py-3.11.10	97.86% <100.00%> (-0.01%)	⬇️
Py-3.11.9	97.33% <100.00%> (-0.02%)	⬇️
Py-3.12.7	98.39% <100.00%> (-0.01%)	⬇️
Py-3.13.0	98.38% <100.00%> (-0.01%)	⬇️
Py-3.9.13	97.20% <100.00%> (-0.01%)	⬇️
Py-3.9.20	97.79% <100.00%> (-0.01%)	⬇️
Py-pypy7.3.16	97.35% <100.00%> (-0.01%)	⬇️
VM-macos	97.44% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	98.33% <100.00%> (-0.01%)	⬇️
VM-windows	96.18% <ø> (ø)

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[webknjaz]

Such a change would require tests to be included.

[webknjaz]

LGTM and the docs render well: https://aiohttp--10074.org.readthedocs.build/en/10074/client_reference.html#aiohttp.ClientSession

[patchback]

Backport to 3.12: 💚 backport PR created

✅ Backport PR branch: patchback/backports/3.12/f733258ed9e5e71b7b97511f5654efd6799cac46/pr-10074

Backported as #10094

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