Create and e2e test where we use multiple encryption keys in a single transaction.

[PhilWindle]

The goal here is to create a contract or multiple contracts that, as part of a single transaction spend funds from multiple owners. It should be possible to:

1. Setup the RPC server with multiple sets of keys so that it is able to resolve the necessary oracle calls
2. Craft a transaction that goes through the account contract of user A, spends funds for user A and then spends 'shared' funds where a constraint on 'msg.sender' is applied as per below.

poke (owner: AztecAddress) {
distributeFunds();
msg.sender in [joe, phil, santiago];
}