feat: Introduce Redis Cluster

[yash30201]

PiperOrigin-RevId: 574225889

[snippet-bot]

Here is the summary of changes.

You are about to add 7 region tags.

• RedisCluster/samples/V1/CloudRedisClusterClient/create_cluster.php:25, tag redis_v1_generated_CloudRedisCluster_CreateCluster_sync
• RedisCluster/samples/V1/CloudRedisClusterClient/delete_cluster.php:25, tag redis_v1_generated_CloudRedisCluster_DeleteCluster_sync
• RedisCluster/samples/V1/CloudRedisClusterClient/get_cluster.php:25, tag redis_v1_generated_CloudRedisCluster_GetCluster_sync
• RedisCluster/samples/V1/CloudRedisClusterClient/get_location.php:25, tag redis_v1_generated_CloudRedisCluster_GetLocation_sync
• RedisCluster/samples/V1/CloudRedisClusterClient/list_clusters.php:25, tag redis_v1_generated_CloudRedisCluster_ListClusters_sync
• RedisCluster/samples/V1/CloudRedisClusterClient/list_locations.php:25, tag redis_v1_generated_CloudRedisCluster_ListLocations_sync
• RedisCluster/samples/V1/CloudRedisClusterClient/update_cluster.php:25, tag redis_v1_generated_CloudRedisCluster_UpdateCluster_sync

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[yash30201]

Component repository created: https://github.com/googleapis/google-cloud-php-redis-cluster