feat: graceful shutdown

[frisitano]

Overview

This PR implements a graceful shutdown for the rollup node to ensure that critical in-flight tasks are driven to completion before shutdown.

Test strategy

The test implemented for this feature is to start up a rollup node externally to the EN, such that we can manually poll it. This is required such that we can simulate a crash/shutdown midway through the processing of a batch. We simulate a crash midway through processing and then ensure that the node can start up and reprocess the latest batch that we crashed at. We assert that the EN safe block progresses to the expected chain tip upon restart.

Note: There may be an edge case in which the finalized head is greater than the safe head on restart, as we revert to the safe head. As such, when we issue the forkchoice rule, we ensure that we only issue an update if the safe block hash is greater than the finalized block hash.

Implementation

The following modifications have been made to support this feature:

• At startup, always reindex the latest block
• Modify database models to do nothing on conflict when inserting new data from the watcher
• Add a method to the database to determine which safe block the node should start at
• Add a utility function to determine the l1 block number the watcher should start at
• Introduce a ConsolidationOutcome type to clean up the consolidation interface
• Only update safe head if the safe head is greater than the finalized head
• Add a run_until_graceful_shutdown function on the RNM and integrate with the reth TaskExecutor
• Migrate the instantiation of the RNM from the ScrollRollupConfig

Update

On startup, we purge all data that is above the latest persisted finalized L1 block number (we assume that L1 has reorged). We then start up the L1 watcher such that we replay from the batch associated with the latest L2 safe block post-purge.

[greged93]

Thank you for refactoring some parts of the code base as well! Left a couple of small inline comments

[greged93]

just a nit and 2 questions, otherwise looks good!

[greged93]

lgtm!