feat: deposit-registry wip

[eddort]

Fixed

• Pause Processing: Validation errors, network issues, and reorganizations in deposits now do not impact the pause processing logic.
• Uncovered Test Scenarios: Identified and covered scenarios that were previously not addressed in existing tests.

Changed

• Module Structure: Overhauled the general structure of the module to accommodate new changes and improve maintainability.
• DepositTree Tests: Revised the entire testing approach for the DepositTree module.
• Hashing Functions in DepositTree: Updated hashing functions to enhance efficiency and reliability.
• Validation Architecture: Introduced a new module, SanityChecker, which now encompasses the validation logic.
• Integrity Checker: Moved IntegrityChecker to the SanityChecker module.
• Blockchain Loading Logic: Extracted blockchain data loading logic into a separate module, improving modularity.
• Event Update Algorithm (updateEventsCache):
  • Explicitly check the blockchain state before updating; if there is a reversion (e.g., from block 10 to block 5), updates from the blockchain are halted and the event is logged.
  • Log the depositRoot from the local state with each chunk of events received, aiding in troubleshooting potential cache issues.
  • Final reconciliation of depositRoot now logs an error without throwing an exception if there is a mismatch.
• Algorithm for Fetching Latest Events (getAllDepositedEvents):
  • Added checks against the blockchain state; serve data from the cache without updating the latest events if the node is lagging.
  • Implemented verifyFreshEvents post-fetch to verify the integrity of new events; errors do not throw exceptions but return a flag, which is checked before attempting deposits.

Refactored

• Module Code: Refactored the outdated module code which had minimal changes over time but led to architectural inefficiencies, hindering proper test coverage.