[Watcher] Delay finalized and latest block query

[greged93]

Currently, the L1 watcher queries the latest and finalized blocks at the same interval as the query for logs. In fast sync (sync up to tip), this means the latest and finalized blocks can be queried without any delay. This means more compute units being required by the provider.

Improve the current execution loop in order to reduce the strain on the provider, querying the blocks every 2 seconds for example.