Add support for `TransactionExtension` + extrinsic version 5

[bkontur]

Relates to: paritytech/polkadot-sdk#3685
Similar issue for PJS: polkadot-js/api#5976

Contact: @georgepisaltu

[bkontur]

Hey guys, how can I submit unsigned transaction, but provide some TransactionExtension data? Is this possible with `getBareTx somehow? I cannot find any example.

For signed calls, it is working for TxExtensionXyz when I am using:

const txOpts = {};
txOpts.customSignedExtensions = TxExtensionXyz { ... };
tx.signSubmitAndWatch(signer, txOpts)

What if I want to add also TxExtensionXyz for unsigned call? Is this even possible?

[carlosala]

Unsigned transactions (or bare, in extrinsic v5) have no extensions. That's the exact difference between bare and general transactions.

[bkontur]

Unsigned transactions (or bare, in extrinsic v5) have no extensions. That's the exact difference between bare and general transactions.

ok, ok, thank you, sorry, my bad.

So, does the PAPI support "general transaction for extrinsic v5" (unsigned with transaction extension data)?
Or what is blocker here? polkadot-fellows/RFCs#148 / polkadot-fellows/RFCs#124?