tools/record: add support for hidraw recording

tools/record: add support for hidraw recording

New commandline switch --with-hidraw. This will open all hidraw devices
associated with this device and add any reports to the output in the
form:

  events:
    - hid:
        time: [0, 0]
        hidraw1: [0x01, 0x02, 0x03, 0x05, 0x06]
	hidraw2: [0x07, 0x08, 0x09, 0x0a, 0x0b]
    - evdev:
      ...

i.e. there's a nesting of `hid` with a list of reports, each with the hidraw
node as dictionary entry.

Because hidraw events do not have timestamps and always occur before the evdev
events, they are in a separate frame (as shown above). We could try to figure
out how to match them with the upcoming evdev frame but it's not worth it for
now.

The timestamp itself is a special key in the hidraw with the timestamp from
clock_gettime.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>