Bring `TransactionExtension` branch up-to-date (#2717)

Merge the branch of https://github.com/paritytech/polkadot-sdk/pull/2280
with `master` as of
[`097308e3`](https://github.com/paritytech/polkadot-sdk/commit/097308e385eca6da20dcef79f1a00f21d4dd5dae

)

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