fix: `CheckMetadataHash` `signedExtension` support

[TarikGul]

closes: https://github.com/polkadot-js/api/issues/5881 rel: https://github.com/paritytech/polkadot-sdk/pull/4274

Update:

Tested

• [x] https://github.com/paritytech/polkadot-sdk/tree/bkchr-metadata-
• [x] Client v1.11.0 polkadot --dev
• [x] Live Westend Relay Chain v1.11.0

Using Txwrapper-core to create the Payloads and to create a SubmittableExtrinsic and a SignedExtrinsic with it, in order to confirm this addition didn't break any historic compatibility.

[TarikGul]

Just as a note, @bee344 is going to take over adding this into the API to free up some resources for me so I can also finish some additional high priority bugs in Apps.

Thanks again @bee344 🙏

[bkchr]

@bee344 when are you planning to tackle this? I will also need this for my pr to pass CI :D

[bee344]

@bkchr I'll do it today

[bkchr]

heads up @bee344 some last minute changes to the signed extension, the signed data is now an Option<Hash>

[bee344]

Tested against https://github.com/paritytech/polkadot-sdk/tree/bkchr-metadata-hash

[TarikGul]

@bee344 Small nits. We should also add a test for in SignerPayload.spec.ts.

[bee344]

Update: Tested against:

1. https://github.com/paritytech/polkadot-sdk/tree/bkchr-metadata-hash
2. Client v1.11.0 polkadot --dev
3. Live Westend Relay Chain v1.11.0

Using Txwrapper-core to create the Payloads and to create a SubmittableExtrinsic and a SignedExtrinsic with it.

[bkchr]

@TarikGul @bee344 could I please get a release with this included?

[TarikGul]

@bkchr Yup, its scheduled to be released today :)

[polkadot-js-bot]

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