Enable validation of metadata attributes - e.g. IsRequired
Currently when a field is marked as IsRequired=true via the OpenAPI attribute it has no relevance to validation. However, it seems very reasonable that when someone marks a field as required, they would want validation that said field was indeed supplied in the DTO. Enabling validation on metadata attributes natively would provide developers this funcitonality without requiring they write a seperate validation method which also lists the required fields.