Fix#23609
Commit 629efb6 introduced thread safety to logger silencing but it
didn't take into account the fact that the logger can be extended with
broadcasting to other logger.
This commit introduces local_level to broadcasting Module which enables
broadcasted loggers to be properly silenced.
- uses instance defined level if no custom local log level defined
- Keeps track of local log level per [ thread + object-instance ]
- prevents memory leakage by removing local level hash key/value on #silence method exit
- avoids the use of Thread local variables
When setting the Rails logger to log to STDOUT, it would broadcast the
log twice in development. This adds a setting that will prevent messages
from being broadcast to multiple logs, while still allowing calls to
`#close`, `#level=`, `#progname=`, and `#formatter=` to be broadcasted.
Fixes#14769, #11415
