Improve error messages from C parser

[Dreamsorcerer]

This adds information to the error messages to show what causes the error.

Exception output looks like:

aiohttp.http_exceptions.BadHttpMessage: 400, message:
  Invalid header value char:

    b'Set-Cookie: abc\x01def\r'
                     ^

[codecov]

Codecov Report

Merging #7366 (7a5b940) into master (41e2c4c) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #7366   +/-   ##
=======================================
  Coverage   97.27%   97.27%           
=======================================
  Files         106      106           
  Lines       31411    31423   +12     
  Branches     3927     3929    +2     
=======================================
+ Hits        30556    30568   +12     
  Misses        650      650           
  Partials      205      205           

Flag	Coverage Δ
CI-GHA	97.22% <100.00%> (+<0.01%)	⬆️
OS-Linux	96.89% <100.00%> (+<0.01%)	⬆️
OS-Windows	95.35% <100.00%> (+<0.01%)	⬆️
OS-macOS	96.57% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	95.27% <100.00%> (+<0.01%)	⬆️
Py-3.10.12	96.78% <100.00%> (+<0.01%)	⬆️
Py-3.11.0	96.51% <81.48%> (-0.02%)	⬇️
Py-3.8.10	95.24% <100.00%> (+<0.01%)	⬆️
Py-3.8.17	96.72% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	95.24% <100.00%> (+<0.01%)	⬆️
Py-3.9.17	96.74% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.11	94.20% <77.77%> (-0.02%)	⬇️
VM-macos	96.57% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	96.89% <100.00%> (+<0.01%)	⬆️
VM-windows	95.35% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
aiohttp/http_exceptions.py	100.00% <100.00%> (ø)
tests/test_http_exceptions.py	100.00% <100.00%> (ø)
tests/test_http_parser.py	99.09% <100.00%> (+<0.01%)	⬆️

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[patchback]

Backport to 3.8: 💔 cherry-picking failed — conflicts found

❌ Failed to cleanly apply 1a48add on top of patchback/backports/3.8/1a48add026e310bb42b7bd38689b281f6651d127/pr-7366

Backporting merged PR #7366 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/3.8/1a48add026e310bb42b7bd38689b281f6651d127/pr-7366 upstream/3.8

4. Now, cherry-pick PR Improve error messages from C parser #7366 contents into that branch:

   $ git cherry-pick -x 1a48add026e310bb42b7bd38689b281f6651d127

   If it'll yell at you with something like fatal: Commit 1a48add026e310bb42b7bd38689b281f6651d127 is a merge but no -m option was given., add -m 1 as follows instead:

   $ git cherry-pick -m1 -x 1a48add026e310bb42b7bd38689b281f6651d127

5. At this point, you'll probably encounter some merge conflicts. You must
   resolve them in to preserve the patch from PR Improve error messages from C parser #7366 as close to the
   original as possible.
6. Push this branch to your fork on GitHub:

   $ git push origin patchback/backports/3.8/1a48add026e310bb42b7bd38689b281f6651d127/pr-7366

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

[patchback]

Backport to 3.9: 💚 backport PR created

✅ Backport PR branch: patchback/backports/3.9/1a48add026e310bb42b7bd38689b281f6651d127/pr-7366

Backported as #7379

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