Change FieldContext.Args to interface{}

[vibridi]

I'm looking for a way to pass arguments down the resolver chain. I've seen #813 and #202 but neither is a good solution IMO.

I noticed there is FieldContext.Args that looks like what I want, but the type is map[string]interface{}. In case where I want to pass only one value this forces me to allocate a map, or use weird workarounds with sync.Pool.

I suggest to change FieldContext.Args to interface{} so that clients can assign whatever value they want.

Please let me know your opinion.

[vibridi]

I realized that Args is used to pass around the resolver arguments