bug: Internalize FNS logic to stage FinalizeBlock events (backport #2399)

[mergify]

Changelist

Context
The FNS manager interface now only includes SendXXXXUpdate, and decides whether to stage or send directly based on the input context.

Test Plan

Testing on feature branch feat/full-node-streaming

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.
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• 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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Summary by CodeRabbit

• New Features

  • Introduced support for order book updates in the event handling system.
  • Added a new method for sending subaccount updates.

• Changes

  • Updated method signatures to streamline the handling of order book fill updates, now focused on single updates instead of batches.
  • Simplified context management across various streaming manager methods.

These enhancements improve the efficiency and clarity of order book and subaccount update processes.

---

This is an automatic backport of pull request #2399 done by [Mergify](https://mergify.com).

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