chore: add indexed to token

Co-authored-by: Milap Sheth <milap@interoplabs.io>

contracts/interfaces/IAxelarGMPTransfer.sol

@@ -21,7 +21,7 @@ interface IInterchainTransferSent {
         string destinationChain,
         string destinationContractAddress,
         bytes recipient,
-        address token,
+        address indexed token,
         uint256 amount
     );
 }