fix: return GetTransactionResponse correctly with getTransaction (#213)

Co-authored-by: Leigh McCulloch <[email protected]>

cmd/crates/stellar-rpc-client/src/lib.rs

@@ -802,7 +802,9 @@ impl Client {
     pub async fn get_transaction(&self, tx_id: &Hash) -> Result<GetTransactionResponse, Error> {
         let mut oparams = ObjectParams::new();
         oparams.insert("hash", tx_id)?;
-        Ok(self.client().request("getTransaction", oparams).await?)
+        let resp: GetTransactionResponseRaw =
+            self.client().request("getTransaction", oparams).await?;
+        Ok(resp.try_into()?)
     }
 
     /// Poll the transaction status. Can provide a timeout in seconds, otherwise uses the default timeout.