Pass transaction source to validate_transaction (#5366)

* WiP

* Support source in the runtime API.

* Finish implementation in txpool.

* Fix warning.

* Fix tests.

* Apply suggestions from code review

Co-Authored-By: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
Co-Authored-By: Nikolay Volf <nikvolf@gmail.com>

* Extra changes.

* Fix test and benches.

* fix test

* Fix test & benches again.

* Fix tests.

* Update bumpalo

* Fix doc test.

* Fix doctest.

* Fix doctest.

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
Co-authored-by: Nikolay Volf <nikvolf@gmail.com>

substrate/test-utils/runtime/transaction-pool/src/lib.rs

@@ -25,6 +25,7 @@ use sp_runtime::{
 	traits::{BlakeTwo256, Hash as HashT},
 	transaction_validity::{
 		TransactionValidity, ValidTransaction, TransactionValidityError, InvalidTransaction,
+		TransactionSource,
 	},
 };
 use std::collections::{HashSet, HashMap};
@@ -180,6 +181,7 @@ impl sc_transaction_graph::ChainApi for TestApi {
 	fn validate_transaction(
 		&self,
 		_at: &BlockId<Self::Block>,
+		_source: TransactionSource,
 		uxt: sc_transaction_graph::ExtrinsicFor<Self>,
 	) -> Self::ValidationFuture {
 		self.validation_requests.write().push(uxt.clone());