feat: more logging for agents

[etorreborre]

This PR:

• Adds a few more logs for: Model, Tool
• Enables the logging of ockam Rust components.
• Allows the user to specify a string setting the logging configuration from inside the main code.

For example:

set_log_levels("agent=debug") 

Will set the logs of the agent actions to the debug level, whereas:

set_log_levels("debug,agent=info")

Will set the logs of all the python modules to debug but the ones from agent to info.

See some other variations in logging_test.py.

Notes

• The loggers are loaded lazily when their corresponding class is accessed for the first time (not just loaded).
• The convention I've used is:
  • At the INFO level: "do action", for example "start agent 'x'"
  • At the DEBUG level: "the action is done" or "the action is done with result: y"

[davide-baldo]

A huge step up in logging!

The merge-base changed after approval.