Include GraphQLValidObjectLocations annotation by default

[danadajian]

Following #42, if a type or an input does not have a matching pair, we need to add the @GraphQLValidObjectLocations annotation with the corresponding input or output location.

Given

type MyType {
  myField: String
}

input MyInput {
  myField: String
}

generate

@GraphQLValidObjectLocations(locations = [GraphQLValidObjectLocations.Locations.OBJECT])
data class MyType(
  myField: String? = null
)

@GraphQLValidObjectLocations(locations = [GraphQLValidObjectLocations.Locations.INPUT_OBJECT])
data class MyInput(
  myField: String? = null
)