refactor: move escrow logs to TRACE and msg body logs to DEBUG

[kentbull]

Description:

• Adds TRACE logging level in keri.help.__init__ module.
• Moves escrow logs to TRACE logging level.
• Moves event body logging to DEBUG level.
• INFO log level contains SAID or prefix of events rather than an event body.
• Uniformly uses log substitution where it would improve performance.
• Uniformly uses f-strings where performance is equivalent yet readability is enhanced.
• serder.pretty() used in favor of serder.ked or json.dumps(serder.ked, indent=1)
• Added escrow-specific strings to each escrow to clarify in logs which escrow produced which log message.
• Various spelling corrections and wording cleanups like Kevery process to Kevery

There will be a separate PR to main for similar changes. Phil has already made similar changes in main.