Changes to POST /v1/users

the response property user_id became optional for the status 201

the user_id response property's minLength was decreased from 1 to 0 for the response status 201

added the optional property created_at to the response with the 201 status

added the optional property graph_entities to the response with the 201 status

added the optional property id to the response with the 201 status

added the optional property is_deleted to the response with the 201 status

added the optional property project to the response with the 201 status

added the optional property updated_at to the response with the 201 status