[Feature Request] Add multiple needles to daq.Gauge #183

One common usage of analog gauges is to have a reference (or target) needle, as well as the current value needle.
This easily allows someone to assess whether current performance is nominal.

Each needle would need it's own style in order to differentiate between them.

Currently, one would need to use CSS to create the appearance of multiple needles. It would be great if it was built-in to Dash!

Current:
layout = daq.Gauge( value=400, max=1600, min=0, )

Proposed:
layout = daq.Gauge( value=[400, 600], needle_style={"color": "black", "color": "red"}, max=1600, min=0, )