Action create interface AppWitness

[agureev]

Currently the signature of Action.create interface is

create(List (NullifierKey, Resource, deltaExtraInput, CMtreePath, CMTreeRoot, List (BitString, DeletionCriterion)), List (Resource, deltaExtraInput, List (BitString, DeletionCriterion)), appWitness: BitString) -> Action

Note that there is only one appWitness specified per an action create interface. Yet one might want to create an action where each resource has its own app witness. That is, the signature should be

create(List (NullifierKey, Resource, deltaExtraInput, CMtreePath, CMTreeRoot, List (BitString, DeletionCriterion), BitString), List (Resource, deltaExtraInput, List (BitString, DeletionCriterion), Bitstring)) -> Action