BM-2304: Support backfilling events, trail chain head to avoid reorgs

[willpote]

RPC sometimes returns 0 logs for the latest block being processed. When run locally at a later date, we see there actually were events for that block.

Likely this is due to either reorgs or just RPC inconsistencies- either way adding a small block delay so we trail chain head, and periodically backfilling to cover anything else missing, should handle this.

• Adds Chain data backfill mode: Re-indexes events from RPC to fix data inconsistencies. Required modifying queries that store events to support upserts
• Added --block-delay to trail the chain head by N blocks to avoids reorgs. Sets to 30 on Base.
• Runs chain data backfills daily (2-day lookback) to catch RPC inconsistencies/reorgs that caused us to miss things

[linear]

BM-2304 Support backfilling events, trail chain head to avoid reorgs