Changes to Assign role to user

the scope_id request property's minLength was increased from 0 to 1

the scope_type request property's minLength was increased from 0 to 1

added the pattern ^[a-z0-9]+(?:[-_][a-z0-9]+)*$ to the request property role_identifier/allOf[subschema #1: Role Identifier]

added the non-success response with the status 400

added the non-success response with the status 404

the role_identifier response's property pattern ^[a-z0-9]+(?:[-_][a-z0-9]+)*$ was added for the status 201

added the required property role_owner_type to the response with the 201 status

endpoint added