chore: restore CODEOWNERS file (#1440)

Author: parthea

.github/CODEOWNERS

@@ -3,10 +3,29 @@
 #
 # For syntax help see:
 # https://help.github.com/en/github/creating-cloning-and-archiving-repositories/about-code-owners#codeowners-syntax
-# Note: This file is autogenerated. To make changes to the codeowner team, please update .repo-metadata.json.
 
-# @googleapis/yoshi-python is the default owner for changes in this repo
-*     @googleapis/yoshi-python
+# @googleapis/cdpe-cloudai and yoshi-python are the default owners
+*                                      @googleapis/cdpe-cloudai @googleapis/yoshi-python
 
-# @googleapis/python-samples-reviewers is the default owner for samples changes
-/samples/   @googleapis/python-samples-reviewers
+# The AI Platform GAPIC libraries are owned by Cloud AI DPE
+/google/cloud/aiplatform_*/**          @googleapis/cdpe-cloudai
+
+# The Vertex SDK is owned by Vertex SDK Dev team
+/google/cloud/aiplatform/**            @googleapis/cloud-aiplatform-model-builder-sdk
+/tests/system/aiplatform/**            @googleapis/cloud-aiplatform-model-builder-sdk
+/tests/unit/aiplatform/**              @googleapis/cloud-aiplatform-model-builder-sdk
+
+# The Cloud AI DPE team is the default owner for samples
+/samples/**/*.py                       @googleapis/cdpe-cloudai @googleapis/python-samples-reviewers
+/.sample_configs/**                    @googleapis/cdpe-cloudai
+
+# The enhanced client library tests are owned by Cloud AI DPE
+/tests/unit/enhanced_library/*.py      @googleapis/cdpe-cloudai
+
+# Core library files owned by Cloud AI DPE and Vertex SDK Dev teams
+CHANGELOG.md                           @googleapis/cloud-aiplatform-model-builder-sdk @googleapis/cdpe-cloudai
+README.rst                             @googleapis/cloud-aiplatform-model-builder-sdk @googleapis/cdpe-cloudai
+setup.py                               @googleapis/cloud-aiplatform-model-builder-sdk @googleapis/cdpe-cloudai
+
+# Vertex AI product team-specific ownership
+/google/cloud/aiplatform/constants/prediction.py                        @googleapis/vertex-prediction-team