core, log: make libraries logging use the MM level and format

The log level of the libraries was not honoring the log level configured in MM, so we would see debug messages reported even if the default log level configured was INFO or MSG.

The format of the logs emitted by the libraries was also not following the format of the rest of MM logs, e.g. they would not include timing info in the logs which would make it hard to follow certain event transitions.

Make the libraries logging use the ModemManager logging method, to fix all those issues.