Add references of resources and test references (#55)

Issue #, if available:
ACK supports references feature for some resources.

Description of changes:
1. Add some reference field for cluster, acl, snapshot, subnet group.
2. Add test files to validate references which are from memorydb itself.

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

Author: kyriechen96

apis/v1alpha1/ack-generate-metadata.yaml

@@ -1,13 +1,13 @@
 ack_generate_info:
-  build_date: "2023-03-02T08:20:25Z"
+  build_date: "2023-03-02T19:20:54Z"
   build_hash: d0f3d78cbea8061f822cbceac3786128f091efe6
   go_version: go1.19
   version: v0.24.2
-api_directory_checksum: ee32acc4d4a0ba7e2823dd20fdbe2c4ef1d9e0f4
+api_directory_checksum: 321c79032b9f73aba90926b35167e224f577ecd6
 api_version: v1alpha1
 aws_sdk_go_version: v1.44.93
 generator_config_info:
-  file_checksum: 24db040eb331d4873d608c73f3318ae9cd11eb02
+  file_checksum: 99d34352ff773953425db4a1251affc22aa523e9
   original_file_name: generator.yaml
 last_modification:
   reason: API generation

apis/v1alpha1/acl.go

@@ -34,6 +34,10 @@ resources:
           input_fields:
             ClusterName: Name
     fields:
+      ACLName:
+        references:
+          resource: ACL
+          path: Spec.Name
       AllowedScaleUpNodeTypes:
         is_read_only: true
         from:
@@ -44,6 +48,28 @@ resources:
         from:
           operation: ListAllowedNodeTypeUpdates
           path: ScaleDownNodeTypes
+      ParameterGroupName:
+        references:
+          resource: ParameterGroup
+          path: Spec.Name
+      SecurityGroupIDs:
+        references:
+          resource: SecurityGroup
+          service_name: ec2
+          path: Status.ID
+      SnapshotName:
+        references:
+          resource: Snapshot
+          path: Spec.Name
+      SNSTopicARN:
+        references:
+          resource: Topic
+          service_name: sns
+          path: Status.ACKResourceMetadata.ARN
+      SubnetGroupName:
+        references:
+          resource: SubnetGroup
+          path: Spec.Name
     hooks:
       sdk_read_many_post_set_output:
         template_path: hooks/cluster/sdk_read_many_post_set_output.go.tpl
@@ -79,6 +105,12 @@ resources:
         - TagQuotaPerResourceExceeded
         - SubnetInUse
         - InvalidParameterValueException
+    fields:
+      SubnetIDs:
+        references:
+          service_name: ec2
+          resource: Subnet
+          path: Status.SubnetID
     hooks:
       sdk_create_post_set_output:
         template_path: hooks/subnetgroup/sdk_create_post_set_output.go.tpl
@@ -117,6 +149,11 @@ resources:
         - InvalidParameterValueException
         - InvalidParameterCombinationException
         - TagQuotaPerResourceExceeded
+    fields:
+      UserNames:
+        references:
+          resource: User
+          path: Spec.Name
     hooks:
       sdk_read_many_post_set_output:
         template_path: hooks/acl/sdk_read_many_post_set_output.go.tpl
@@ -213,6 +250,14 @@ resources:
         from:
           operation: CreateSnapshot
           path: ClusterName
+        references:
+          resource: Cluster
+          path: Spec.Name
+      KmsKeyId:
+        references:
+          resource: Key
+          service_name: kms
+          path: Status.ACKResourceMetadata.ARN
     update_operation:
       custom_method_name: customUpdate
     hooks:

apis/v1alpha1/cluster.go

@@ -64,6 +64,22 @@ spec:
                 items:
                   type: string
                 type: array
+              userRefs:
+                items:
+                  description: "AWSResourceReferenceWrapper provides a wrapper around
+                    *AWSResourceReference type to provide more user friendly syntax
+                    for references using 'from' field Ex: APIIDRef: \n from: name:
+                    my-api"
+                  properties:
+                    from:
+                      description: AWSResourceReference provides all the values necessary
+                        to reference another k8s resource for finding the identifier(Id/ARN/Name)
+                      properties:
+                        name:
+                          type: string
+                      type: object
+                  type: object
+                type: array
             required:
             - name
             type: object