Add logger level control flag, take 2.

This adds --logger_levels, a flag that allows setting the log levels of
loggers by name.

This makes it easy to adjust log levels on a per-logger basis without having
to write application code to do so.

Changes from original:
 * Use empty dict as the default value to work around some dependencies
   relying on the default matching the parsed value.
 * Return a copy instead of `MappingProxyType` because values are expected
   to be compatible with `copy.deepcopy()`

PiperOrigin-RevId: 305493905
Change-Id: Ib826653b58d621aebc89aa1ded69647c534cde13

0 files changed, 0 insertions, 0 deletions