Add packet capture and match network_stack adb command to to `apf_utils`

It wraps the following 3 commands for multi-devices tests
- cmd network_stack capture start <interface>
- cmd network_stack capture stop <interface>
- cmd network_stack capture matched-packet-counts <interface> <pkt-in-hex>

Add a helper function `is_packet_capture_supported` as APFv6 precondition check.
Test: atest NetworkStaticLibHostPythonTests

Change-Id: I526c678c6e753cee3969b04a56ab33e5e3d1600d
2 files changed