Add web_application_options setting to configure the web application (#551)

[wbarnha]

What

The aiohttp web driver always constructed aiohttp.web.Application() with no arguments, so there was no way to configure the embedded web server — e.g. raise client_max_size or install middlewares.

Closes #551.

How

Added a new web_application_options mapping setting. Its contents are forwarded as keyword arguments to the web framework's application object; for the default aiohttp driver they go straight to aiohttp.web.Application(**options):

from aiohttp.web import middleware

@middleware
async def error_middleware(request, handler):
    ...

app = App(..., web_application_options={
    'client_max_size': 1024 ** 2 * 20,
    'middlewares': [error_middleware],
})

Defaults to None (no options), preserving the previous behaviour exactly. The accepted keys depend on the configured web driver.

Changes

• faust/types/settings/settings.py — new web_application_options setting (params.Dict[Any]) + __init__ parameter, with a documented docstring.
• faust/web/drivers/aiohttp.py — Web.__init__ now builds Application(**(app.conf.web_application_options or {})).

Test

• tests/unit/web/drivers/test_aiohttp.py — test_web_application_options asserts the options are forwarded to Application(...); test_web_application_options__default asserts the no-option default calls Application().
• tests/functional/test_app.py — added the setting to the config default check (is None) and to the round-trip assert_config_equivalent set/assert flow.

All affected suites pass (138 passed).

🤖 Generated with Claude Code

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Generated by Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.15%. Comparing base (3073eb9) to head (0b471c8).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #704   +/-   ##
=======================================
  Coverage   94.14%   94.15%           
=======================================
  Files         104      104           
  Lines       11136    11136           
  Branches     1201     1201           
=======================================
+ Hits        10484    10485    +1     
+ Misses        551      550    -1     
  Partials      101      101           

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