Handle restarts during historical processing in watcher

[nikugogoi]

Part of Block processing optimizations

• Add latestProcessedBlockNumber and latestProcessedBlockHash to sync status
• Reset job-runner to latest processed block on watcher restarts
• During historical processing update sync status in job-runner for handling server restarts
• Use sync status latest processed block for subgraph _meta query
• Set jobs per interval in events job queue subscription to 1