[WIP][Consensus] Leader Election - Round Robin (secondary)

[jessicadaugherty]

Objective

Implement a secondary, round-robin leader election mechanism to be used when the primary VRF sortition with CDF fails to produce a value. This ensures that the consensus process continues even when the primary leader election method fails.

Origin Document

Primary Leader Election

V0 References:

• Implementation: https://github.com/pokt-network/tendermint/blob/746fd7abc65ee1c019c8196cd878ff4b12aff5ba/types/validator_set.go#L86
• Test: https://github.com/pokt-network/tendermint/blob/746fd7abc65ee1c019c8196cd878ff4b12aff5ba/types/validator_set_test.go#L138

V1 References:

• https://github.com/pokt-network/pocket/tree/main/consensus/leader_election

Goals

• Implement a fallback round-robin leader election mechanism that will be used when the primary VRF sortition with CDF fails.
• Integrate the round-robin leader election into the existing consensus process seamlessly.

Deliverable

• Design and implement the round-robin leader election mechanism
• Modify the existing consensus process to use the round-robin leader election when the primary VRF sortition with CDF fails

Non-goals / Non-deliverables

• Modifying the primary VRF sortition with CDF leader election process
• Making round-robin the primary leader election mechanism

General issue deliverables

• Update the appropriate CHANGELOG
• Update any relevant READMEs (local and/or global)
• Update any relevant global documentation & references
• If applicable, update the source code tree explanation
• If applicable, add or update a state, sequence or flowchart diagram using mermaid

Testing Methodology

• 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: @jessicadaugherty

[jessicadaugherty]

This one is a little light as I couldn't find the code for reference in pocket core but ptal when you have a chance @Olshansk

[Olshansk]

This one is a little light as I couldn't find the code for reference in pocket core but ptal when you have a chance @Olshansk

Added