Added Namron

[isolife]

Added Namron 4512773
https://www.zigbee2mqtt.io/devices/4512773.html#namron-4512773

[Eising]

Hey @isolife,

We submitted more or less the same PR with just hours in between. We should probably combine our PRs.

It's more or less the same device we're adding, but with two product numbers (dark vs light perhaps?), but our approaches are slightly diverging.

If we combine ours, I imagine there is a better chance of them getting merged sooner rather than later.