Add UI soultion for coin change in transaction to contracts.

[MaxRoslovs]

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Tech part (API) is already implemented. 3. There is another topic that we have carefully avoided for many years. With the increasing number of transactions in contracts, the question of exchanging coins arises. But then I took out a hundred BEAM from the exchange and let’s do two transactions at a time. It is necessary to add the possibility of exchanging coins so as not to multiply transactions. ///you can even put a checkbox on the receiver screen, or on the send... so that it can be exchanged first and then sent