Add Stateright.rs model checking tests

[drmingdrmer]

Parent issue: #475

Overview

Add Stateright.rs model checking tests to validate openraft's correctness. Stateright is a Rust-native distributed systems testing framework that can be embedded directly into the test suite.

Goals

• Model check core Raft properties
• Verify safety properties (no split-brain, log consistency)
• Verify liveness properties (leader election, log replication)
• Complement Jepsen with faster, deterministic testing

Advantages over Jepsen

• Written in Rust, integrates directly with openraft
• Faster iteration during development
• Deterministic execution for reproducible bugs
• No external infrastructure required

Implementation Steps

• Add stateright as dev-dependency
• Create model of openraft cluster
• Define safety properties to check
• Define liveness properties to check
• Add to CI pipeline

References

• Stateright documentation
• Stateright GitHub
• Stateright Raft example

[github-actions]

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