Enable RefundSurplus and DepositAsset instructions for XCM Transactor

[Agusrodri]

What does it do?

Currently, xcm-transactor pallet and precompile don't allow senders to make usage of RefundSurplus and DepositAsset instructions, which normally causes assets get trapped on the destination chain. This PR enables such functionality.

Changes

• Modified transact_through_signed(), transact_through_derivative() and transact_through_sovereign() functions to accept an additional bool parameter (called refund) that indicates if RefundSurplus and DepositAsset instructions will be used. These instructions are included inside an appendix that will execute them at the end of the execution of the whole XCM message.
• Added transactThroughSignedRefund(), transactThroughSignedMultilocationRefund(), transactThroughDerivativeRefund() and transactThroughDerivativeMultilocationRefund() functions to xcm-transactor precompile V2. These functions receive the same parameters as the normal previous ones, but this time adding the appendix with RefundSurplus and DepositAsset behind the scenes. It was thought this way to not break any kind of existing compatibility.

Notes

• If the appendix is set within transact_through_derivative() or transact_through_sovereign(), the remaining surplus will be refunded to the sovereign account.

[crystalin]

@Agusrodri this will need to be updated. I merged master but there are some compilation errors

[Agusrodri]

@Agusrodri this will need to be updated. I merged master but there are some compilation errors

@crystalin yes, I think this PR will be closed in favor of a new one containing this and other necessary changes for the xcm-transactor precompile to be upgraded to V3.

[Agusrodri]

Closed in favor of #2338