MMR: move RPC code from frame/ to client/ (#12805)

* mmr: move MMR RPC from frame/ to client/

Signed-off-by: Adrian Catangiu <adrian@parity.io>

* client/mmr: adjust logging levels to avoid spam

* cargo fmt

* remove unused imports

Signed-off-by: Adrian Catangiu <adrian@parity.io>

substrate/frame/merkle-mountain-range/src/lib.rs

@@ -57,10 +57,17 @@
 #![cfg_attr(not(feature = "std"), no_std)]
 
 use frame_support::{log, weights::Weight};
+use sp_mmr_primitives::utils;
 use sp_runtime::{
 	traits::{self, One, Saturating},
 	SaturatedConversion,
 };
+use sp_std::prelude::*;
+
+pub use pallet::*;
+pub use sp_mmr_primitives::{
+	self as primitives, utils::NodesUtils, Error, LeafDataProvider, LeafIndex, NodeIndex,
+};
 
 #[cfg(feature = "runtime-benchmarks")]
 mod benchmarking;
@@ -71,13 +78,6 @@ mod mock;
 #[cfg(test)]
 mod tests;
 
-pub use pallet::*;
-use sp_mmr_primitives::utils;
-pub use sp_mmr_primitives::{
-	self as primitives, utils::NodesUtils, Error, LeafDataProvider, LeafIndex, NodeIndex,
-};
-use sp_std::prelude::*;
-
 /// The most common use case for MMRs is to store historical block hashes,
 /// so that any point in time in the future we can receive a proof about some past
 /// blocks without using excessive on-chain storage.

substrate/frame/merkle-mountain-range/src/mock.rs

@@ -29,7 +29,6 @@ use sp_runtime::{
 	testing::Header,
 	traits::{BlakeTwo256, IdentityLookup, Keccak256},
 };
-use sp_std::prelude::*;
 
 type UncheckedExtrinsic = frame_system::mocking::MockUncheckedExtrinsic<Test>;
 type Block = frame_system::mocking::MockBlock<Test>;