[Feature] Add new CLI flag `-l/--log-level` which sets the desired log level for the compiler output

[Luna-Klatzer]

Is there an existing proposal for this?

• [X] I have searched the existing issues

This feature does not exist in the latest version

• [X] I am using the latest version

Proposal

Add a new flag -l/--log-level, which allows the user to specify what log output should be printed onto the console.

The available options should be:

• FATAL
• ERROR
• WARN
• INFO
• DEBUG
• UNKNOWN

Exact behaviour / changes you want

• Add new flag -l/--log-level to the Kipper CLI commands analyse, compile and run.