Add NATGateway CRD (#43)

Issue #, if available:

Description of changes:
Creates the `NATGateway` CRD, with references to `ElasticIPAddress` and `Subnet` for their respective fields

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Author: RedbackThomson

apis/v1alpha1/ack-generate-metadata.yaml

@@ -1,13 +1,13 @@
 ack_generate_info:
-  build_date: "2022-03-22T20:05:53Z"
+  build_date: "2022-03-23T01:22:49Z"
   build_hash: 6f659f796434e8fd6443c0b3a5b495daae910035
-  go_version: go1.17.5
+  go_version: go1.17.8
   version: v0.18.0
-api_directory_checksum: c9ac09820420d1c7cbe615b8baa14da9f72aab08
+api_directory_checksum: cc3671a6c2f26f433ffe32815ccfaa24d12e42d1
 api_version: v1alpha1
 aws_sdk_go_version: v1.42.0
 generator_config_info:
-  file_checksum: 8cdcf3f86b878ab3f30b3e102a5a6b1df8dfafb3
+  file_checksum: 721b58308fb63699f1ac3c233e529189e7d59c4c
   original_file_name: generator.yaml
 last_modification:
   reason: API generation

apis/v1alpha1/generator.yaml

@@ -6,6 +6,8 @@ ignore:
     - AllocateAddressInput.DryRun
     - CreateDhcpOptionsInput.DryRun
     - CreateInternetGatewayInput.DryRun
+    - CreateNatGatewayInput.ClientToken
+    - CreateNatGatewayInput.DryRun
     - CreateRouteInput.DryRun
     - CreateRouteInput.RouteTableId
     - CreateRouteTableInput.DryRun
@@ -46,7 +48,7 @@ ignore:
     - LocalGatewayRouteTableVpcAssociation
     - LocalGatewayRoute
     - ManagedPrefixList
-    - NatGateway
+    #- NatGateway
     - NetworkAclEntry
     - NetworkAcl
     - NetworkInsightsPath
@@ -101,6 +103,8 @@ operations:
     operation_type:
     - Delete
     resource_name: ElasticIPAddress
+  CreateNatGateway:
+    output_wrapper_field_path: NatGateway
   CreateVpcEndpoint:
     output_wrapper_field_path: VpcEndpoint
   DeleteVpcEndpoints:
@@ -187,6 +191,21 @@ resources:
         template_path: hooks/elastic_ip_address/sdk_read_many_pre_build_request.go.tpl
       sdk_read_many_post_build_request:
         template_path: hooks/elastic_ip_address/sdk_read_many_post_build_request.go.tpl
+  NatGateway:
+    fields:
+      AllocationId:
+        references:
+          resource: ElasticIPAddress
+          path: Status.AllocationID
+      SubnetId:
+        references:
+          resource: Subnet
+          path: Status.SubnetID
+    synced:
+      when:
+      - path: Status.State
+        in:
+        - available
   SecurityGroup:
     fields:
       # support EC2-VPC only