fix(cmd/paratime): Revamp paratime stats

Removed primary invoked statistics as primary workers are expected
to be continuously active.
Introduced new statistics to monitor node's block proposals as primary
or backup proposer.
Reorganized columns within the entity statistics table to improve
clarity.
Fixed a bug that led to inaccurate statistics when the discrepancy
event for the first finalized block occurred before the start block.
Resolved a bug that caused events from the start block to be skipped.