Add new send_frame method to WebSockets

[bdraco]

What do these changes do?

Currently there is no way to send TEXT frames when the source data is a UTF-8 encoded bytes object without having decode the bytes to string before passing it to send_str, and than having the WebSocket internals encode it back to bytes. When sending at volume, the extra decode/encode cycle is a significant bottleneck.

Are there changes in behavior for the user?

no

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

no

[bdraco]

Thanks for the review

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.56%. Comparing base (9314651) to head (2a29b72).
Report is 1 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9348   +/-   ##
=======================================
  Coverage   98.55%   98.56%           
=======================================
  Files         107      107           
  Lines       34915    34949   +34     
  Branches     4138     4139    +1     
=======================================
+ Hits        34412    34446   +34     
  Misses        335      335           
  Partials      168      168           

Flag	Coverage Δ
CI-GHA	98.44% <100.00%> (+<0.01%)	⬆️
OS-Linux	98.10% <100.00%> (+<0.01%)	⬆️
OS-Windows	96.51% <100.00%> (+<0.01%)	⬆️
OS-macOS	97.79% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	97.66% <100.00%> (+<0.01%)	⬆️
Py-3.10.15	97.60% <100.00%> (+<0.01%)	⬆️
Py-3.11.10	97.66% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	97.72% <100.00%> (-0.01%)	⬇️
Py-3.12.6	98.15% <100.00%> (+<0.01%)	⬆️
Py-3.13.0-rc.2	98.13% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	97.56% <100.00%> (-0.01%)	⬇️
Py-3.9.20	97.50% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	97.12% <100.00%> (+<0.01%)	⬆️
VM-macos	97.79% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	98.10% <100.00%> (+<0.01%)	⬆️
VM-windows	96.51% <100.00%> (+<0.01%)	⬆️

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[patchback]

Backport to 3.11: 💔 cherry-picking failed — conflicts found

❌ Failed to cleanly apply 2628256 on top of patchback/backports/3.11/2628256c0a4bea74b9fec9169c7fbefe622fcac1/pr-9348

Backporting merged PR #9348 into master

1. Ensure you have a local repo clone of your fork. Unless you cloned it
   from the upstream, this would be your origin remote.
2. Make sure you have an upstream repo added as a remote too. In these
   instructions you'll refer to it by the name upstream. If you don't
   have it, here's how you can add it:

   $ git remote add upstream https://github.com/aio-libs/aiohttp.git

3. Ensure you have the latest copy of upstream and prepare a branch
   that will hold the backported code:

   $ git fetch upstream
   $ git checkout -b patchback/backports/3.11/2628256c0a4bea74b9fec9169c7fbefe622fcac1/pr-9348 upstream/3.11

4. Now, cherry-pick PR Add new send_frame method to WebSockets #9348 contents into that branch:

   $ git cherry-pick -x 2628256c0a4bea74b9fec9169c7fbefe622fcac1

   If it'll yell at you with something like fatal: Commit 2628256c0a4bea74b9fec9169c7fbefe622fcac1 is a merge but no -m option was given., add -m 1 as follows instead:

   $ git cherry-pick -m1 -x 2628256c0a4bea74b9fec9169c7fbefe622fcac1

5. At this point, you'll probably encounter some merge conflicts. You must
   resolve them in to preserve the patch from PR Add new send_frame method to WebSockets #9348 as close to the
   original as possible.
6. Push this branch to your fork on GitHub:

   $ git push origin patchback/backports/3.11/2628256c0a4bea74b9fec9169c7fbefe622fcac1/pr-9348

7. Create a PR, ensure that the CI is green. If it's not — update it so that
   the tests and any other checks pass. This is it!
   Now relax and wait for the maintainers to process your pull request
   when they have some cycles to do reviews. Don't worry — they'll tell you if
   any improvements are necessary when the time comes!

🤖 @patchback
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