Refactor tx-pool maintenance and other high-level api (#4629)

* Reduction.

* Reformation.

* add locked timer stuff

* fix issues and introduce full pool

* arrange together

* fix benches

* fix new_light

* Add revalidation test case

* review fixes

* review fixes

* use just ready future

* address review

substrate/client/transaction-pool/graph/src/validated_pool.rs

@@ -63,7 +63,7 @@ pub type ValidatedTransactionFor<B> = ValidatedTransaction<
 
 /// Pool that deals with validated transactions.
 pub(crate) struct ValidatedPool<B: ChainApi> {
-	api: B,
+	api: Arc<B>,
 	options: Options,
 	listener: RwLock<Listener<ExHash<B>, BlockHash<B>>>,
 	pool: RwLock<base::BasePool<
@@ -76,7 +76,7 @@ pub(crate) struct ValidatedPool<B: ChainApi> {
 
 impl<B: ChainApi> ValidatedPool<B> {
 	/// Create a new transaction pool.
-	pub fn new(options: Options, api: B) -> Self {
+	pub fn new(options: Options, api: Arc<B>) -> Self {
 		let base_pool = base::BasePool::new(options.reject_future_transactions);
 		ValidatedPool {
 			api,