[Watcher] Optimize sync

[greged93]

The following sync optimization should be explored:

• Reverse sync: sync all L1 messages then start looking for commit logs starting at the L1 finalized block and going back to genesis. At the first batch, construct the FCS and only issue a single FCU.
• Parallel derivation: derive the payload attributes in parallel to the EN sync. Store the attributes in database and start passing attributes when the EN is synced. Similar to reverse sync, start at the end.