feat: support read unlock witness from other index position #28
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In most cases, the RGBPPUnlock is located at group_input[0].lock.
For RGB++ cells which seal UTXOs in the same BTC transaction, the RGBPPUnlock is also the same.
Therefore, to reduce duplicated witness, we can pass an index to group_input[0].lock.
In such a situation, we load RGBPPUnlock from the index position.