rpc: Implement GetUnspentTransactionOutputSet #1145
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Requires #1075. Will also be simpler with #1045.
Implements a new asynchronous method to retrieve the entire UTXO set for the best chain (at the moment of calling).
I'm not entirely happy with the way the hash of the chain tip of the moment the UTXO snapshot is taken is communicated. Because gRPC allows methods to return streams, the one value could not be returned in a call. Instead, it is sent by the caller (who sends the best hash at the moment of calling) and the server returns an error if a new block was added to the blockchain in the meantime.