Changes to Create a metric policy

added the new optional request property metrics/items/settings

added the required property data/metrics/items/settings to the response with the 201 status

added the new conflict enum value to the type response property for the response status 400

added the new conflict enum value to the type response property for the response status 401

added the new conflict enum value to the type response property for the response status 403

added the new conflict enum value to the type response property for the response status 429

added the new conflict enum value to the type response property for the response status 500

added the new payment_required enum value to the type response property for the response status 400

added the new payment_required enum value to the type response property for the response status 401

added the new payment_required enum value to the type response property for the response status 403

added the new payment_required enum value to the type response property for the response status 429

added the new payment_required enum value to the type response property for the response status 500