* support best Beefy RPC through arc<mutex>
* beefy RPC through lockless message passing - 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 RPC through lockless message passing
* beefy: use specialized type definitions
* bubble up service errors from BEEFY RPC
* update lockfile for substrate
Co-authored-by: parity-processbot <>