[Utility][Persistence][Consensus] Implement SavePoints & Rollbacks

[deblasis]

Objective

This issue is going to be an "umbrella" ticket/epic used to wrap and link all the intermediate steps/deliverables that are necessary to build Savepoints and Rollbacks as highlighted in the Design Document - Issue #493

Origin Document

This is the result of R&D work on #508 which was essentially asking the assignee to build savepoints and rollbacks, just with a different wording thanks to a more "practical" problem to solve.

Goals

• Implement an abstraction that can contain the operations performed on the various persistence datastores (as described in the design document) and apply/rollback them atomically
• Implement a way to serialize and deserialize the whole persistence state so that's possible to create snapshots and rehydrate them
• Implement the Moonshot parts of the design document (perhaps out-of-scope for now? I won't include the deliverables below but please let me know if I should)
• Ensure that the state of the modules is restored in case of a rollback

Deliverable

• Work stream A
  • [Utility][Persistence][Savepoints/Rollbacks] Refactor UtilityContext into UtilityUnitOfWork #563
  • [Persistence][Core][Savepoints/Rollbacks] Implement KISS SavePoints - Serialize WorldState from Persistence #327
  • [Utility][Persistence][Savepoints/Rollbacks] Implement change tracking in UtilityUnitOfWork to allow ephemeral state and remove side effects #564
  • [Persistence][Core][Savepoints/Rollbacks] Implement KISS Rollbacks - Deserialize WorldState to Persistence #435
  • [Utility][Persistence][Savepoints/Rollbacks] Implement Snapshots - Persist SavePoints #567
  • [Utility][Persistence][Savepoints/Rollbacks] Implement Rollback from Snapshot #568
• Work stream B
  • [Tooling][Savepoints/Rollbacks] Implement RPC endpoints for Snapshots/Rollbacks (no-op / faked) #565
  • [Tooling][Savepoints/Rollbacks] Implement CLI commands for Snapshots/Rollbacks #566
• Work stream AB (when A & B are completed)
  • [Tooling][Savepoints/Rollbacks] Integrate Snapshots and Rollbacks with RPC #570
  • [?] Moonshots TBD

Non-goals / Non-deliverables

• Changes in logic with particular focus to Consensus

General issue deliverables

• Update the appropriate CHANGELOG(s)
• Update any relevant local/global README(s)
• Update relevant source code tree explanations
• Add or update any relevant or supporting mermaid diagrams

Testing Methodology

• Task specific tests or benchmarks: make ...
• New tests or benchmarks: make ...
• All tests: make test_all
• LocalNet: verify a LocalNet is still functioning correctly by following the instructions at docs/development/README.md

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Creator: @deblasis
Co-Owners: @Olshansk