[Feature] RFC 5424 Log Levels

[benmAltDesign]

What problem does this solve?

Related to #4, support for log levels would help support logging in frameworks which support multiple log levels / full RFC 5424 syslog scale

Proposed solution

Alternatives you've considered

No response

Which area does this affect?

Other

Additional context

RFC 5424 log levels -

Log::emergency() — system is unusable
Log::alert() — action must be taken immediately
Log::critical() — critical conditions
Log::error() — runtime errors
Log::warning() — something unexpected but not an error
Log::notice() — normal but significant events
Log::info() — general informational messages
Log::debug() — detailed diagnostic info