[Access] DataProviders does not catch invalid arguments

[Guitarheroua]

🐞 Bug Report

The EventsDataPreovider does not notify clients about the invalid arguments. For example, if subscribe like the example below, the subscription is correctly created without any fail and error message:

{
    "action": "subscribe",
    "topic": "events",
    "arguments": {
        "heartbeat_interval": "10",
        "start_block_height": "103001001",
        "dummy": "dummy"
    }
}

Expected behaviour

It should be impossible to subscribe with invalid arguments and return an error in response.

[illia-malachyn]

This problem shows up in every data provider. While parsing the arguments, providers look only for the needed fields, allowing users to pass additional fields that won't be validated. However, I'm unsure how bad it is and whether it's worth spending time on it.

@peterargue What do you think about it?