fix: CheckMetadataHash signedExtension support (#5882)

* CheckMetadataHash support

* lint

* updtated CheckGenesis

* linting

* added getters for metadataHash

* fixed metadataHash type

* fixed toHuman override

* updated SignerPayload

* updated mode to take AnyNumber

---------

Co-authored-by: bee344 <alberto.penayo@parity.io>

packages/api-base/src/types/submittable.ts

@@ -3,7 +3,7 @@
 
 import type { Observable } from 'rxjs';
 import type { AccountId, Address, ApplyExtrinsicResult, BlockNumber, Call, DispatchError, DispatchInfo, EventRecord, Extrinsic, ExtrinsicStatus, Hash, RuntimeDispatchInfo } from '@polkadot/types/interfaces';
-import type { AnyFunction, AnyNumber, AnyTuple, Callback, CallBase, Codec, IExtrinsicEra, IKeyringPair, ISubmittableResult, Signer } from '@polkadot/types/types';
+import type { AnyFunction, AnyNumber, AnyTuple, AnyU8a, Callback, CallBase, Codec, IExtrinsicEra, IKeyringPair, ISubmittableResult, Signer } from '@polkadot/types/types';
 import type { ApiTypes, EmptyBase, PromiseOrObs } from './base.js';
 
 export type AugmentedSubmittable<T extends AnyFunction, A extends AnyTuple = AnyTuple> = T & CallBase<A>;
@@ -17,6 +17,8 @@ export interface SignerOptions {
   signer?: Signer;
   tip?: AnyNumber;
   assetId?: AnyNumber | object;
+  mode?: AnyNumber;
+  metadataHash?: AnyU8a;
 }
 
 export type SubmittableDryRunResult<ApiType extends ApiTypes> =