Added set parent, root and ingress to QDiscDelRequest

[ViniciosLugli]

Extend the QDiscDelRequest struct with additional methods (parent, root, and ingress) to enable functionality equivalent to the CLI command qdisc del dev INTERFACE ingress. This change allows for more granular control when deleting qdiscs, specifically targeting ingress qdiscs on network interfaces. For example:

handle.qdisc().del(index).ingress().execute().await;

now directly maps to the command:

qdisc del dev INTERFACE ingress