Validation error contains argument index or name

[Vivien-marble]

Better validation error

When an operator refuse an argument (wrong type), the error is annotated with the argument index or name.

type EvaluationErrorDto struct {
	EvaluationError string  `json:"error"`
	Message         string  `json:"message"`
	ArgumentIndex   *int    `json:"argument_index,omitempty"`
	ArgumentName    *string `json:"argument_name,omitempty"`
}

[Pascal-Delange]

👍
I like this because that should allow us to slowly separate the "raw stacktrace" errors from the thing we display in front