Add BEEFY `latestFinalized` RPC and deduplicate code between BEEFY and GRANDPA (#10568)
* beefy: add dummy latest_finalized() RPC * beefy: rpc latest_best_beefy() using shared mem * beefy: rpc populate latest_best_beefy() * beefy: rpc handle readiness * beefy: best block over channel - wip Not working because channel can't be simply opened and receiver passed to `rpc_extensions_builder` because `rpc_extensions_builder` has to be `Fn` and not `FnOnce`... and and Receiver side of mpsc can't be cloned yay!.. * beefy: make notification channels payload-agnostic * beefy: use notification mechanism instead of custom channel * beefy: add tracing key to notif channels * sc-utils: add notification channel - wip * beefy: use sc-utils generic notification channel * grandpa: use sc-utils generic notification channel * fix grumbles * beefy-rpc: get best block header instead of number * beefy-rpc: rename to `beefy_getFinalizedHead` * fix nitpicks * client-rpc-notifications: move generic Error from struct to fn * beefy: use header from notification instead of getting from database * beefy-rpc: get best block hash instead of header * beefy-rpc: fix and improve latestHead test * beefy-rpc: bubble up errors from rpc-handler instantiation * update lockfile * Apply suggestions from code review Co-authored-by: André Silva <[email protected]> * fix errors and warnings * fix nit Co-authored-by: André Silva <[email protected]>
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