Replace BATCH_CALL_SUPPORTED (#1733)

* Simplify submit_and_watch_signed_extrinsic

The way submit_and_watch_signed_extrinsic is used now, we can always
derive the SignParam from other params. If in the future we need more
customization possibilities, we can define a new method.

* Simplify submit_signed_extrinsic

* Send maybe_batch_tx as a parameter

Send `maybe_batch_tx` as a parameter to `submit_proof()`. This way we
can deduplicate the logic that submits the extrinsic for
`messages_source and `messages_target` and we can simplify the logic in
the race loop a bit.

* Define BatchProofTransaction

Deduplicate BatchConfirmationTransaction and BatchDeliveryTransaction by
replacing both of them with BatchProofTransaction

* Define ChainWithUtilityPallet and BatchCallBuilderConstructor

- Define `ChainWithUtilityPallet` in order to be able to associate the
  batching functionality with chains
- Defining `BatchCallBuilderConstructor` in order to have a more reliable
  way of checking whether an end of a messages pipeline supports batching
  or no. `BatchCallBuilderConstructor::new_builder()` returns an
  `Option<BatchCallBuilder>`.This is a bit safer because each time a caller
  tries to start creating a batch call, it will call `new_builder()` and
  will be required to handle the returned `Option`. Before we only had a
  bool `BATCH_CALL_SUPPORTED` the caller could have forgetten to check.

bridges/relays/bin-substrate/src/cli/init_bridge.rs

@@ -29,7 +29,7 @@ use crate::{
 	cli::{bridge::CliBridgeBase, chain_schema::*},
 };
 use bp_runtime::Chain as ChainBase;
-use relay_substrate_client::{AccountKeyPairOf, Chain, SignParam, UnsignedTransaction};
+use relay_substrate_client::{AccountKeyPairOf, Chain, UnsignedTransaction};
 use sp_core::Pair;
 use structopt::StructOpt;
 use strum::{EnumString, EnumVariantNames, VariantNames};
@@ -83,17 +83,10 @@ where
 		let target_sign = data.target_sign.to_keypair::<Self::Target>()?;
 		let dry_run = data.dry_run;
 
-		let (spec_version, transaction_version) = target_client.simple_runtime_version().await?;
 		substrate_relay_helper::finality::initialize::initialize::<Self::Engine, _, _, _>(
 			source_client,
 			target_client.clone(),
-			target_sign.public().into(),
-			SignParam {
-				spec_version,
-				transaction_version,
-				genesis_hash: *target_client.genesis_hash(),
-				signer: target_sign,
-			},
+			target_sign,
 			move |transaction_nonce, initialization_data| {
 				let call = Self::encode_init_bridge(initialization_data);
 				log::info!(