Sign inner transactions, contract delegations, raw data

[davidyuk]

Inner transactions

It is a transaction that can be used as a payload for pay-for-tx. Snap should accept a flag to add "inner_tx" after the network id while signing the transaction.

https://github.com/aeternity/aepp-sdk-js/blob/6c2dbfe0f2bcf708985da4eee6e3045aefd6310f/src/account/Memory.ts#L14-L17

Also, this should be indicated to the user.

Contract delegations

A delegation is expected to be provided as a buffer. Use unpackDelegation to show its details to the user. If confirmed, sign delegation this way.

Raw data, unsafe signing

There are edge cases, like signing a JWT where this ability is necessary. Example interface: https://github.com/aeternity/aepp-sdk-js/blob/6c2dbfe0f2bcf708985da4eee6e3045aefd6310f/src/aepp-wallet-communication/rpc/types.ts#L53-L56