[Feature] Frontend: error code unfied and toast message

[robocanic]

What would you like to be added:

Unified the error codes of backend api response. Toast message by "${code}:${message}".

Why is this needed:
Unified the error codes is useful when we encounter some problems. The error response structure is like below:

{
    "code":  "UnknownError",
    "message": "mesh of name `test` is not found",
}

And the success response is below:

{
    "code":  "Success",
    "message": "string",
    "data": {
        "operatorLog": true
    }
}

Frontend devs need to concat the code and message and toast it in case we can find the problem earlier.

[robocanic]

This feature has been implemented in #1355, closed