* grandpa-rpc: use FinalityProofProvider to check finality for rpc
* grandpa-rpc: minor tidy
* grandpa-rpc: remove dyn FinalityProofProvider
* grandpa-rpc: remove unused dependencies
* node: move finality_proof_provider setup
* grandpa-rpc: print error reported by finality_proof_provider
* grandpa-rpc: add note about unnecessary encode/decode
* grandpa-rpc: dont encode/decode and use correct hash
* grandpa-rpc: set_id is optional
* grandpa-rpc: create test for prove_finality
* grandpa-rpc: set visibility back to how it was
* grandpa-rpc: remove unused dependency
* grandpa-rpc: minor tidy
* grandpa: doc strings
* grandpa-rpc: rename to prove_finality
* grandpa-rpc: use current set id if none is provided
* grandpa-rpc: remove unnecessary check in test
* node: group finality_proof_provider in rpc_setup
* grandpa: make prove_finality concrete in FinalityProofProvider
* grandpa-rpc: wrap finality output in struct and store as Bytes
* grandpa-rpc: exhaustive error codes and wrap
* grandpa-rpc: let prove_finality take a range instead of a starting point
* grandpa-rpc: fix test for changed API
* grandpa-rpc: fix line length
* grandpa: fix reviewer nits
* node/rpc: fix reviewer comments