Allow tracing message_transact transaction

[boundless-forest]

Close darwinia-network/darwinia#1018

For an extrinsic which contains dispatch call Receive_messages_delivery_proof, in which contains Ethereum::message_transact, the original trace_transaction only considers the Ethereum::transact, not cover message_transact.

example like this: https://pangolin.subscan.io/extrinsic/3607818-1

You'll get the following result If you try to fetch the execute tracing log:

curl http://g4.pangolin-p2p.darwinia.network:9933 -H "Content-Type:application/json;charset=utf-8" -d '{ "jsonrpc":"2.0", "id":1, "method":"debug_traceTransaction", "params": ["0x2f154faf56ece403a0eb351d8abf5d583a607088f93c2f3b039edfb3f9b8ed7e", {"disableStorage": true, "disableMemory": true, "disableStack": true}]}' | jq

{
  "jsonrpc": "2.0",
  "error": {
    "code": -32603,
    "message": "DispatchError: Other(\"\")"
  },
  "id": 1
}

This error generated at https://github.com/darwinia-network/moonbeam/blob/master/client/rpc/debug/src/lib.rs#L512

let _result = api
        .trace_transaction(&parent_block_id, exts, &transaction)    // Type: Result<Result<(), DispatchError>, ApiError>, Result: Ok(Err(sp_runtime::DispatchError::Other("Failed to find Ethereum transaction among the extrinsics."))
        .map_err(|e| {
            internal_err(format!(
                "Runtime api access error (version {:?}): {:?}",
                trace_api_version, e
            ))
        })?     // Result<(), DispatchError>
        .map_err(|e| internal_err(format!("DispatchError: {:?}", e)))?;

[boundless-forest]

Prefer to add a new runtime function. Close this first.