Add --override-logging CLI flag to opt out of root logger reconfiguration

[wbarnha]

Description

Fixes faust-streaming/mode#36
("faust hijacks console output"). A user who configures structlog (or a plain
logging.basicConfig()) before starting a faust worker finds all output
re-prefixed with [date] [pid] [LEVEL] once the worker starts, destroying their
formatting.

Root cause: mode.utils.logging.setup_logging() unconditionally does
logging.root.handlers.clear() and reconfigures the root logger with mode's
colorlog formatter. mode.Worker already gates this behind
override_logging: bool = True — Worker(..., override_logging=False) skips
_setup_logging() entirely. The gap is on the faust side: its CLI
(Command.worker_for_service()) built the Worker with a hardcoded kwarg list
that never passed override_logging through, and there was no CLI flag — so
anyone running the standard faust worker command couldn't reach a lever that
already existed one layer down.

This adds --override-logging/--no-override-logging, following the exact
compat_option pattern already used for --loglevel / --blocking-timeout /
--console-port:

CLI flag -> State.override_logging -> Command._override_logging
         -> Command.override_logging property (default True) -> Worker(override_logging=...)

The default is True, matching mode.Worker's own default, so existing
behavior is unchanged. No faust-streaming/mode change is needed — the
parameter already exists there.

Changes

• faust/cli/base.py: new State.override_logging field, the
  --override-logging/--no-override-logging compat_option, the
  Command._override_logging attribute + __init__ read, the public
  override_logging property (None → True fallback), and the
  Worker(override_logging=...) pass-through.
• tests/unit/cli/test_base.py: updated test_worker_for_service's exact
  kwarg assertion and added test_override_logging for the property.

Verification

• pytest tests/unit/cli/test_base.py → 66 passed, 1 pre-existing skip.
• faust ... worker --help shows the new --override-logging / --no-override-logging flag.
• flake8 clean on both files.

Fixes faust-streaming/mode#36.

🤖 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 (d95af52) to head (ef0c009).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #711   +/-   ##
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  Coverage   94.15%   94.15%           
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  Files         104      104           
  Lines       11136    11145    +9     
  Branches     1201     1201           
=======================================
+ Hits        10485    10494    +9     
  Misses        550      550           
  Partials      101      101           

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