[Tracking upstream] Addition of TransactionExtension

[TarikGul]

rel: paritytech/polkadot-sdk#3685

More info to be added to this issue as I learn more about the change, and what it means for the api.

[TarikGul]

Completed via #5976

[polkadot-js-bot]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue if you think you have a related problem or query.