NatGatewayState type  
Defines values for NatGatewayState. 
KnownNatGatewayState can be used interchangeably with NatGatewayState,
this enum contains the known values that the service supports.
Known values supported by the service
Enabled: Nat Gateway is enabled for the service. 
Disabled: Nat Gateway is disabled for the service.
type NatGatewayState = string