qos: T8996: Implement set-dscp packet remarking for shaper policy

The set-dscp option was defined in XML but never implemented in
Python — no tc commands were generated to rewrite DSCP on egress.
Add tc pedit actions to shaper filter commands. The pedit target
is chosen per-match: IPv4 uses "ip dsfield", IPv6 uses
"ip6 traffic_class". Ether matches with protocol ip or ipv6 also
get the corresponding pedit; other non-IP match types skip pedit
to avoid corrupting packets like ARP. The retain 0xfc mask
preserves ECN bits. For IPv4, a csum ip4h action recalculates
the header checksum after pedit. For the default class, separate
catch-all filters (prio 255/256) are added per protocol.

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