[JS-Evaluator] - Add logging to js-evaluator for better debuggability

Logging should be added for the following scenarios:

In golang process / embedder process:

• Log at each stage of new engine initialisation with Engine UUID as identifier.
• Engine initialisation success and failure.
• Engine shutdown.

• js-evaluator / C++ process crash and respawn.

In C++ process / C world of CGO:

• Upon receiving config change events like: log level change, udf proxy server config event, create, engine create, engine shutdown.