Default field value for Input Object

[Vincz]

Q	A
Bug report?	yes
Version/Branch	1.1.0

The changes introduce in this PR #1143, breaks the usage of default value in PHP for Input fields. @deeky666

#[GQL\Input]
class TestInput {
    #[GQL\Field(type: "String")]
    public string myField = "default_value"; // <-- This doesn't work anymore
}

Either the MetadataParser should check this when generating the type and add a defaultValue on the input field, or this field should be skip in the ArgumentsTransformer.
Adding an FieldInput annotation/attribute should also be considered (as currently, the #GQL\Field does not allow a default value).