chore: plug GRANDPA proveFinality RPC to standalone node #217
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Context
t3rn rangers, client-side binaries, feeds the headers out of any relaychain/standalone GRANDPA-based chain into a t3rn parachian. Ranger expects the rpc.grandpa.proveFinality to be there, which is usually hooked into Relay chains.
I've seen that Grandpa pallet is plugged into Bittensor at https://polkadot.js.org/apps/?rpc=wss%253A%252F%252Fentrypoint-finney.opentensor.ai%253A443# so that's very good. Just that RPC methods allowing proving finality aren't connected to subtensor.
Description
This PR connects GRANDPA RPC to subtensor nodes. Following GRANDPA RPCs are now available: