feat: mining-state-machine, display inactive reasons #494
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draft PR for now. I will add some screenshots and notes later.
closes #423
implements a custom finite-state-machine that processes events in the mining loop and handles state-transitions.
benefits/reasons:
Simplify the complex code in the mining loop so it is more maintainable.
move towards a lock-free mining loop, which means less possibility of delay for miners.
Cleanly support granular display of mining-status, so user can see a message like "waiting for block proposal" rather than just "inactive".
consolidate/unify pause and unpause logic, since pausing can occur for different reasons.
Make the core logic of transitioning between mining states testable via unit tests.