Avoid creating body writer task when there is no body

[bdraco]

The client would create a task to write the body even if the body was b""

Since GET requests tend to be some of the most common, it makes sense to optimize for the case where only headers are sent.

aiohttp 3.11.0b4 yarl 1.17.1

This PR:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.67%. Comparing base (44d809f) to head (20a015b).
Report is 1 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9757   +/-   ##
=======================================
  Coverage   98.67%   98.67%           
=======================================
  Files         117      117           
  Lines       35896    35931   +35     
  Branches     4263     4267    +4     
=======================================
+ Hits        35420    35455   +35     
  Misses        320      320           
  Partials      156      156           

Flag	Coverage Δ
CI-GHA	98.56% <97.82%> (+<0.01%)	⬆️
OS-Linux	98.24% <97.82%> (+<0.01%)	⬆️
OS-Windows	96.02% <97.82%> (+<0.01%)	⬆️
OS-macOS	97.32% <97.82%> (+<0.01%)	⬆️
Py-3.10.11	97.16% <91.30%> (+<0.01%)	⬆️
Py-3.10.15	97.72% <91.30%> (+<0.01%)	⬆️
Py-3.11.10	97.77% <91.30%> (+<0.01%)	⬆️
Py-3.11.9	97.21% <91.30%> (-0.01%)	⬇️
Py-3.12.7	98.31% <95.65%> (+<0.01%)	⬆️
Py-3.13.0	98.25% <95.65%> (-0.05%)	⬇️
Py-3.9.13	97.08% <91.30%> (+<0.01%)	⬆️
Py-3.9.20	97.68% <91.30%> (+<0.01%)	⬆️
Py-pypy7.3.16	97.25% <91.30%> (+<0.01%)	⬆️
VM-macos	97.32% <97.82%> (+<0.01%)	⬆️
VM-ubuntu	98.24% <97.82%> (+<0.01%)	⬆️
VM-windows	96.02% <97.82%> (+<0.01%)	⬆️

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[codspeed-hq]

CodSpeed Performance Report

Merging #9757 will improve performances by 39.02%

_{Comparing no_task_no_body_to_Write (20a015b) with master (44d809f)}

Summary

⚡ 1 improvements
✅ 13 untouched benchmarks

Benchmarks breakdown

	Benchmark	master	no_task_no_body_to_Write	Change
⚡	test_send_client_request_one_hundred[pyloop]	4.4 ms	3.2 ms	+39.02%

[patchback]

Backport to 3.11: 💚 backport PR created

✅ Backport PR branch: patchback/backports/3.11/b2c845bb22a4c4090b8312786085bdda5bad0b75/pr-9757

Backported as #9759

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.

[bdraco]

This might have introduced a regression on sending an empty body with chunked.. although we likely have a guard to not do chunked with empty body I'm not sure its tested

[bdraco]

nope, seems ok but will add a test