Set providers/common/pushdown owner to fq (#11301)

Author: kardymonds

.github/CODEOWNERS

@@ -20,6 +20,7 @@
 /ydb/library/yql/dq @ydb-platform/yql @ydb-platform/qp
 /ydb/library/yql/providers/common/http_gateway @ydb-platform/fq
 /ydb/library/yql/providers/common/db_id_async_resolver @ydb-platform/fq
+/ydb/library/yql/providers/common/pushdown @ydb-platform/fq
 /ydb/library/yql/providers/generic @ydb-platform/fq
 /ydb/library/yql/providers/pq @ydb-platform/fq
 /ydb/library/yql/providers/s3 @ydb-platform/fq