Misc updates: performance, logging, hacking

[Nashatyrev]

PR Description

A batch of minor updates:

Performance:

• 3f2bba6: pass shared SecureRandom for new NodeSession instead of expensive creation a new instance
• 91446d7: use faster non-secure Random instead of SecureRandom to generate Envelope UUID which is used internally (for logging only)
• 6631150: use faster non-secure Random instead of SecureRandom to generate 'random message': there is no need for secure random here (even a static zeroes payload should not compromise the security)

Logging:

• c9ce3c5: reduce logging exception noise when logging with DEBUG level

Hacking:

• aa33963: add an option to skip ENR signature verification for testing/hacking purposes

[ajsutton]

LGTM.

[ajsutton]

Given we only use this for logging, I wonder if we'd be better off just using AtomicLong.getAndIncrement to assign a simple unique identifier. Could seed it with a large number if we wanted to keep it reasonably long and easier to search for.

[Nashatyrev]

Yeah, makes sense 👍 ffb9501
Minor modifications to your idea:

• initialize the id generator with only upper 32 bits randomly generated to easily track envelope ordering with eyes.
• return id as a hex String

[ajsutton]

Nice. :)