Add a Request.wait_for_disconnection() method (#4200)

[Dreamsorcerer]

as means of allowing request handlers to be notified of premature client disconnections.

Co-Authored-By: Andrew Svetlov andrew.svetlov@gmail.com
(cherry picked from commit 7f77733)

[codecov]

Codecov Report

Attention: Patch coverage is 28.57143% with 10 lines in your changes missing coverage. Please review.

Project coverage is 97.39%. Comparing base (3bc89fe) to head (a3b9065).
Report is 1 commits behind head on 3.10.

Files	Patch %	Lines
aiohttp/web_request.py	23.07%	8 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             3.10    #8504      +/-   ##
==========================================
- Coverage   97.49%   97.39%   -0.10%     
==========================================
  Files         108      108              
  Lines       33374    33388      +14     
  Branches     4004     4006       +2     
==========================================
- Hits        32537    32519      -18     
- Misses        611      637      +26     
- Partials      226      232       +6     

Flag	Coverage Δ
CI-GHA	97.31% <28.57%> (-0.09%)	⬇️
OS-Linux	96.98% <28.57%> (-0.09%)	⬇️
OS-Windows	94.68% <28.57%> (-0.03%)	⬇️
OS-macOS	96.71% <28.57%> (-0.03%)	⬇️
Py-3.10.11	96.82% <28.57%> (-0.03%)	⬇️
Py-3.10.14	96.78% <28.57%> (-0.03%)	⬇️
Py-3.11.9	97.01% <28.57%> (-0.04%)	⬇️
Py-3.12.4	97.12% <28.57%> (-0.03%)	⬇️
Py-3.8.10	94.42% <28.57%> (-0.03%)	⬇️
Py-3.8.18	96.67% <28.57%> (-0.03%)	⬇️
Py-3.9.13	96.81% <28.57%> (-0.03%)	⬇️
Py-3.9.19	96.78% <28.57%> (-0.03%)	⬇️
Py-pypy7.3.16	?
VM-macos	96.71% <28.57%> (-0.03%)	⬇️
VM-ubuntu	96.98% <28.57%> (-0.09%)	⬇️
VM-windows	94.68% <28.57%> (-0.03%)	⬇️

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