Introduce Logging Facade for Agent

[amitjoy]

Is your feature request related to a problem? Please describe.
Currently the agent doesn't log exceptions and ignore them completely which makes debugging agent issues very difficult. That's why, we should certainly introduce logging in agent.

Describe the solution you'd like
Since the agent should work independent to the availability of any logging, it should optionally import the logger backends and if no logger backend is available, it should fallback to logging on console.

Describe alternatives you've considered
System.out.println and System.out.printly or mandatory dependency to either slf4j or JUL etc.

Additional context
NA