Please add samples for:

• storage_get_soft_deleted_bucket
• storage_list_soft_deleted_buckets
• storage_restore_soft_deleted_bucket

References in Java PR: https://github.com/googleapis/java-storage/pull/2806/files#diff-66a114c215b2fac090c9b3b875188b9cafeb56190955b50241c7476eb7976e6eR1