Look up a transaction by its hash. This is the same hash that is returned
by the API when submitting a transaction (see PendingTransaction).
When given a transaction hash, the server first looks for the transaction
in storage (on-chain, committed). If no on-chain transaction is found, it
looks the transaction up by hash in the mempool (pending, not yet committed).
To create a transaction hash by yourself, do the following:
Hash message bytes: "RawTransaction" bytes + BCS bytes of Transaction.
Apply hash algorithm SHA3-256 to the hash message bytes.
Hex-encode the hash bytes with 0x prefix.
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