qosify: add package for simple qos based on ebpf+cake

qosify is simple daemon for setting up and managing CAKE along with a custom
eBPF based classifier that sets DSCP fields of packets.

It is configured via UCI and it supports the following features:
- simple TCP/UDP port based mapping
- IP address based mapping
- priority boosting based on average packet size
- bulk flow detection based on number of packets per second
- dynamically add IP entries with timeout

Signed-off-by: Felix Fietkau <nbd@nbd.name>

package/network/config/qosify/files/qosify-defaults.conf

@@ -0,0 +1,17 @@
+# DNS
+tcp:53		CS5
+tcp:5353	CS5
+udp:53		CS5
+udp:5353	CS5
+
+# NTP
+udp:123		CS6
+
+# SSH
+tcp:22		+CS4
+
+# HTTP/QUIC
+tcp:80		+CS3
+tcp:443		+CS3
+udp:80		+CS3
+udp:443		+CS3