As part of PM-2448, we want to expose the verbose category and verbosity level as additional metadata in the message. This ticket aims to update the WT_EVENT_HANDLER code paths to expose this additional metadata as part of the message. In particular the following items will need to be addressed as part of this tickets DoD.

Definition of Done:

• Update the internal '__eventv' method to take in a verbose category and level metadata fields.
• Support internal message paths (using the event handler interface) that don't specify verbose categories & levels - i.e. ‘wt_err’ & ‘wt_panic’ 
  • By defining a default verbose category these paths can fallback on.
  • By defaulting uses of these methods to the appropriate verbosity level i.e.  ‘WT_VERBOSE_ERROR’.