Move FinalizeBlock event staging logic into a generic EventStager (backport #2435)

[mergify]

Changelist

Create a new EventStager struct that manages the staging and retrieval of FinalizeBlock event, so that it can be used by all modules.

Test Plan

Tested FNS via localnet.

Author/Reviewer Checklist

• If this PR has changes that result in a different app state given the same prior state and transaction list, manually add the state-breaking label.
• If the PR has breaking postgres changes to the indexer add the indexer-postgres-breaking label.
• If this PR isn't state-breaking but has changes that modify behavior in PrepareProposal or ProcessProposal, manually add the label proposal-breaking.
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• If you wish to for mergify-bot to automatically create a PR to backport your change to a release branch, manually add the label backport/[branch-name].
• Manually add any of the following labels: refactor, chore, bug.

Summary by CodeRabbit

• New Features

  • Introduced a new EventStager for efficient staging and retrieval of events during the FinalizeBlock process.
  • Enhanced event management in the FullNodeStreamingManager with a new dependency on the finalizeblock package.

• Bug Fixes

  • Removed unused and non-functional methods related to finalized subaccount updates, streamlining the code.

• Documentation

  • Updated interface definitions to reflect the removal of the SendFinalizedSubaccountUpdates method across various components.

---

This is an automatic backport of pull request #2435 done by [Mergify](https://mergify.com).

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