Emhancement: Make I2C devices "shareable" about diozero HOT 2 CLOSED

There is a "workaround" which does pretty much what the above suggests, but I think it would probably be better suited to the device factories themselves.

NativeDeviceFactoryInterface factory = DeviceFactoryHelper.getNativeDeviceFactory();
String key = factory.createI2CKey(controller, address);
Device device = factory.getDevice(key);
if (device == null) device = I2CDevice(controller, address);

from diozero.

Actually, since I tried out two multiplexers, this notion is pretty terrible and should not be included as a "base option" -- the "workaround" above is better suited to those devices that muck around with the I²C bus than the actual factory.

from diozero.