BlockId removal: refactor: ProofProvider (#12519)

* BlockId removal: refactor: ProofProvider

It changes the arguments of methods of `ProofProvider` trait from:
block: `BlockId<Block>` to: hash: `&Block::Hash`

This PR is part of BlockId::Number refactoring analysis (paritytech/substrate#11292)

* LightClientRequestHandler: excessive BlockIdTo bound removed

* imports cleanup

* formatting

* args tyeps cleanup

substrate/client/rpc/src/state/state_full.rs

@@ -345,7 +345,7 @@ where
 		self.block_or_best(block)
 			.and_then(|block| {
 				self.client
-					.read_proof(&BlockId::Hash(block), &mut keys.iter().map(|key| key.0.as_ref()))
+					.read_proof(&block, &mut keys.iter().map(|key| key.0.as_ref()))
 					.map(|proof| proof.iter_nodes().map(|node| node.into()).collect())
 					.map(|proof| ReadProof { at: block, proof })
 			})
@@ -494,7 +494,7 @@ where
 				};
 				self.client
 					.read_child_proof(
-						&BlockId::Hash(block),
+						&block,
 						&child_info,
 						&mut keys.iter().map(|key| key.0.as_ref()),
 					)