PoV Reclaim Runtime Side (#3002)

# Runtime side for PoV Reclaim

## Implementation Overview
- Hostfunction to fetch the storage proof size has been added to the
PVF. It uses the size tracking recorder that was introduced in my
previous PR.
- Mechanisms to use the reclaim HostFunction have been introduced.
- 1. A SignedExtension that checks the node-reported proof size before
and after application of an extrinsic. Then it reclaims the difference.
- 2. A manual helper to make reclaiming easier when manual interaction
is required, for example in `on_idle` or other hooks.
- In order to utilize the manual reclaiming, I modified `WeightMeter` to
support the reduction of consumed weight, at least for storage proof
size.

## How to use
To enable the general functionality for a parachain:
1. Add the SignedExtension to your parachain runtime. 
2. Provide the HostFunction to the node
3. Enable proof recording during block import

## TODO
- [x] PRDoc

---------

Co-authored-by: Dmitry Markin <dmitry@markin.tech>
Co-authored-by: Davide Galassi <davxy@datawok.net>
Co-authored-by: Bastian Köcher <git@kchr.de>

cumulus/test/service/src/lib.rs

@@ -112,7 +112,7 @@ pub type AnnounceBlockFn = Arc<dyn Fn(Hash, Option<Vec<u8>>) + Send + Sync>;
 pub struct RuntimeExecutor;
 
 impl sc_executor::NativeExecutionDispatch for RuntimeExecutor {
-	type ExtendHostFunctions = ();
+	type ExtendHostFunctions = cumulus_client_service::storage_proof_size::HostFunctions;
 
 	fn dispatch(method: &str, data: &[u8]) -> Option<Vec<u8>> {
 		cumulus_test_runtime::api::dispatch(method, data)
@@ -894,11 +894,12 @@ pub fn construct_extrinsic(
 		frame_system::CheckNonce::<runtime::Runtime>::from(nonce),
 		frame_system::CheckWeight::<runtime::Runtime>::new(),
 		pallet_transaction_payment::ChargeTransactionPayment::<runtime::Runtime>::from(tip),
+		cumulus_primitives_storage_weight_reclaim::StorageWeightReclaim::<runtime::Runtime>::new(),
 	);
 	let raw_payload = runtime::SignedPayload::from_raw(
 		function.clone(),
 		extra.clone(),
-		((), runtime::VERSION.spec_version, genesis_block, current_block_hash, (), (), ()),
+		((), runtime::VERSION.spec_version, genesis_block, current_block_hash, (), (), (), ()),
 	);
 	let signature = raw_payload.using_encoded(|e| caller.sign(e));
 	runtime::UncheckedExtrinsic::new_signed(