ClatdController - Add simple dump output for trackers and ebpf clat map

(heavily based on work by Lorenzo Colitti)

Test: atest netd_unit_test, and manually via 'adb shell dumpsys netd'
Bug: 65674744
Signed-off-by: Lorenzo Colitti <lorenzo@google.com>
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I0565a0c78bf655d099d68d3462b8eb7cf4e34483