entgql: support SkipMutationCreateInput (and update) on entity

[freb]

Before this change, when SkipMutationCreateInput was annotated on an entity, the CreateXxxInput was omitted from the gql_mutation_input.go generated types, but still included in the ent.graphql generated schema. The same was true for SkipMutationUpdateInput.

To work around this, you could use entgql.Mutations to select only the ones you want generated. But, according to the annotation comments, using SkipMutationCreateInput in this way should be supported.

For example, this works as expected:

func (File) Annotations() []schema.Annotation {
	return []schema.Annotation{
		entgql.Mutations(entgql.MutationUpdate()),
	}
}

While this does not (it still generates CreateFileInput in ent.graphql):

func (File) Annotations() []schema.Annotation {
	return []schema.Annotation{
		entgql.Mutations(),
		entgql.Skip(entgql.SkipMutationCreateInput),
	}
}

This change adds the proper checks to buildMutationInputs to omit the specified mutation inputs from the GraphQL schema.

There are no entities in the example code using a skip annotation at the entity level.

[a8m]

Thanks for the contribution, @freb.

This is a breaking change, but @giautm and I will discuss if this can be added with version update.

[giautm]

Thank you for your contribution

[a8m]

Thanks for the contribution, @freb.

This is a breaking change, but @giautm and I will discuss if this can be added with version update.

Too fast @giautm. I will bump a version