Add GlobalCluster object/api (#33)

Issue #, if available: aws-controllers-k8s/community#973

Description of changes:
This change adds the GlobalCluster object/api to rds-controller.

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

Author: rbranche

apis/v1alpha1/ack-generate-metadata.yaml

@@ -1,13 +1,13 @@
 ack_generate_info:
-  build_date: "2021-09-30T17:17:12Z"
+  build_date: "2021-10-05T23:44:00Z"
   build_hash: 2b0ac062dd6d305434d252b5da5ed718c801b106
-  go_version: go1.17
+  go_version: go1.17.1
   version: v0.14.1
-api_directory_checksum: 183f450ec5188cdb1cf76da50f21933f6b4cd7e3
+api_directory_checksum: cd0469d4474d82dbcf9badb97a43cac68ba07044
 api_version: v1alpha1
 aws_sdk_go_version: v1.37.10
 generator_config_info:
-  file_checksum: e6d75d736bdcf3b5649f48ac2945fff9041b44f8
+  file_checksum: ec38b79b167ebd86c08109049864acd6a21e5113
   original_file_name: generator.yaml
 last_modification:
   reason: API generation

apis/v1alpha1/generator.yaml

@@ -14,7 +14,7 @@ ignore:
     - DBSnapshot
     #- DBSubnetGroup
     - EventSubscription
-    - GlobalCluster
+    #- GlobalCluster
     - OptionGroup
   field_paths:
 operations:
@@ -144,6 +144,16 @@ resources:
         is_primary_key: true
       MasterUserPassword:
         is_secret: true
+  GlobalCluster:
+    exceptions:
+      terminal_codes:
+        - DBClusterNotFoundFault
+        - GlobalClusterAlreadyExistsFault
+        - GlobalClusterQuotaExceededFault
+        - InvalidDBClusterStateFault
+    fields:
+      GlobalClusterIdentifier:
+        is_primary_key: true
   DBParameterGroup:
     renames:
       operations: