feat: [AppsEventsSubscriptions] add new client library surface for Subscription PHP

[vishwarajanand]

PiperOrigin-RevId: 607029780

Generated by command: dev/google-cloud add-component google/apps/events/subscriptions/v1/subscriptions_service.proto --googleapis-gen-path ../googleapis-gen/

Source-Link: googleapis/googleapis@b36b446

Source-Link: https://github.com/googleapis/googleapis-gen/commit/b365dcf9a469c408cebf3c82b139e988f2442e0c

[snippet-bot]

Here is the summary of changes.

You are about to add 6 region tags.

• AppsEventsSubscriptions/samples/V1/SubscriptionsServiceClient/create_subscription.php:25, tag workspaceevents_v1_generated_SubscriptionsService_CreateSubscription_sync
• AppsEventsSubscriptions/samples/V1/SubscriptionsServiceClient/delete_subscription.php:25, tag workspaceevents_v1_generated_SubscriptionsService_DeleteSubscription_sync
• AppsEventsSubscriptions/samples/V1/SubscriptionsServiceClient/get_subscription.php:25, tag workspaceevents_v1_generated_SubscriptionsService_GetSubscription_sync
• AppsEventsSubscriptions/samples/V1/SubscriptionsServiceClient/list_subscriptions.php:25, tag workspaceevents_v1_generated_SubscriptionsService_ListSubscriptions_sync
• AppsEventsSubscriptions/samples/V1/SubscriptionsServiceClient/reactivate_subscription.php:25, tag workspaceevents_v1_generated_SubscriptionsService_ReactivateSubscription_sync
• AppsEventsSubscriptions/samples/V1/SubscriptionsServiceClient/update_subscription.php:25, tag workspaceevents_v1_generated_SubscriptionsService_UpdateSubscription_sync

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[vishwarajanand]

https://github.com/googleapis/php-apps-events-subscriptions is created