feat: introduce AdsDataManager

[bshaffer]

b/454340683

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• AdsDataManager/samples/V1/IngestionServiceClient/ingest_audience_members.php:25, tag datamanager_v1_generated_IngestionService_IngestAudienceMembers_sync
• AdsDataManager/samples/V1/IngestionServiceClient/ingest_events.php:25, tag datamanager_v1_generated_IngestionService_IngestEvents_sync
• AdsDataManager/samples/V1/IngestionServiceClient/remove_audience_members.php:25, tag datamanager_v1_generated_IngestionService_RemoveAudienceMembers_sync
• AdsDataManager/samples/V1/IngestionServiceClient/retrieve_request_status.php:25, tag datamanager_v1_generated_IngestionService_RetrieveRequestStatus_sync

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[bshaffer]

This must wait unti the repo is created until we can merge it

[bshaffer]

This is now unblocked! https://github.com/googleapis/php-ads-data-manager has been created