[Core] Node finite state machine

[deblasis]

Objective

Have a FSM (Finite State Machine) that we can leverage to have different operating modes for the node depending on its internal state.

Origin Document

While developing #416, I identified the first real use case for different operating modes.

Specifically, when a new node joins the cluster, it doesn't know anything about the world and needs bootstrapping #498

Goals

• Develop a simple state machine integrated with the bus
• Have a way to visualize it easily

Deliverable

• FSM implementation
• Make target to generate a mermaid diagram of the current state machine
• Initial working state machine that handles the P2P bootstrapping and the synched state for nodes that are already part of consensus (the first 4 in Localnet)

Non-goals / Non-deliverables

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

[deblasis]

This is already done, just tracking the work done.

Specifically the implementation is here 1a92565

I have added a make target to generate a mermaid diagram and the first implementation of the FSM looks like this: