Removal of execution strategies (#14387)

* Start

* More work!

* Moar

* More changes

* More fixes

* More worrk

* More fixes

* More fixes to make it compile

* Adds `NoOffchainStorage`

* Pass the extensions

* Small basti making small progress

* Fix merge errors and remove `ExecutionContext`

* Move registration of `ReadRuntimeVersionExt` to `ExecutionExtension`

Instead of registering `ReadRuntimeVersionExt` in `sp-state-machine` it is moved to
`ExecutionExtension` which provides the default extensions.

* Fix compilation

* Register the global extensions inside runtime api instance

* Fixes

* Fix `generate_initial_session_keys` by passing the keystore extension

* Fix the grandpa tests

* Fix more tests

* Fix more tests

* Don't set any heap pages if there isn't an override

* Fix small fallout

* FMT

* Fix tests

* More tests

* Offchain worker custom extensions

* More fixes

* Make offchain tx pool creation reusable

Introduces an `OffchainTransactionPoolFactory` for creating offchain transactions pools that can be
registered in the runtime externalities context. This factory will be required for a later pr to
make the creation of offchain transaction pools easier.

* Fixes

* Fixes

* Set offchain transaction pool in BABE before using it in the runtime

* Add the `offchain_tx_pool` to Grandpa as well

* Fix the nodes

* Print some error when using the old warnings

* Fix merge issues

* Fix compilation

* Rename `babe_link`

* Rename to `offchain_tx_pool_factory`

* Cleanup

* FMT

* Fix benchmark name

* Fix `try-runtime`

* Remove `--execution` CLI args

* Make clippy happy

* Forward bls functions

* Fix docs

* Update UI tests

* Update client/api/src/execution_extensions.rs

Co-authored-by: Michal Kucharczyk <1728078+michalkucharczyk@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Koute <koute@users.noreply.github.com>

* Update client/cli/src/params/import_params.rs

Co-authored-by: Koute <koute@users.noreply.github.com>

* Update client/api/src/execution_extensions.rs

Co-authored-by: Koute <koute@users.noreply.github.com>

* Pass the offchain storage to the MMR RPC

* Update client/api/src/execution_extensions.rs

Co-authored-by: Sebastian Kunert <skunert49@gmail.com>

* Review comments

* Fixes

---------

Co-authored-by: Michal Kucharczyk <1728078+michalkucharczyk@users.noreply.github.com>
Co-authored-by: Koute <koute@users.noreply.github.com>
Co-authored-by: Sebastian Kunert <skunert49@gmail.com>

substrate/client/statement-store/src/lib.rs

@@ -59,7 +59,9 @@ use sp_blockchain::HeaderBackend;
 use sp_core::{hexdisplay::HexDisplay, traits::SpawnNamed, Decode, Encode};
 use sp_runtime::traits::Block as BlockT;
 use sp_statement_store::{
-	runtime_api::{InvalidStatement, StatementSource, ValidStatement, ValidateStatement},
+	runtime_api::{
+		InvalidStatement, StatementSource, StatementStoreExt, ValidStatement, ValidateStatement,
+	},
 	AccountId, BlockHash, Channel, DecryptionKey, Hash, NetworkPriority, Proof, Result, Statement,
 	SubmitResult, Topic,
 };
@@ -491,8 +493,7 @@ impl Store {
 			+ 'static,
 		Client::Api: ValidateStatement<Block>,
 	{
-		let store = Arc::new(Self::new(path, options, client.clone(), prometheus)?);
-		client.execution_extensions().register_statement_store(store.clone());
+		let store = Arc::new(Self::new(path, options, client, prometheus)?);
 
 		// Perform periodic statement store maintenance
 		let worker_store = store.clone();
@@ -696,6 +697,11 @@ impl Store {
 	fn set_time(&mut self, time: u64) {
 		self.time_override = Some(time);
 	}
+
+	/// Returns `self` as [`StatementStoreExt`].
+	pub fn as_statement_store_ext(self: Arc<Self>) -> StatementStoreExt {
+		StatementStoreExt::new(self)
+	}
 }
 
 impl StatementStore for Store {