RBv2 LED control and lpGBT GPIOs

We have several LEDs that we can control from software at our disposal. I have already switched the default value of the SCA LED to 1, so it automatically comes on if the SCA can configure its GPIOs. Something similar can be done for the LEDs on the lpGBT, e.g. turn on LED1 when the lpGBT configure is done, and LED2 once tamalero finishes successfully. A nice idea would be to spawn a thread that blinks Rhett's eyes for e.g. 10 seconds when everything is done, then keeps them on.

At the same time we should improve how we configure the GPIOs on the lpGBT. Right now we only have this function https://gitlab.cern.ch/cms-etl-electronics/module_test_sw/-/blob/master/tamalero/LPGBT.py#L333, but it would be nice to use a mapping dictionary similar to the SCA.