Add use of logic analyzer to Interrupts lab

[lhstrh]

This requires a logic analyzer, but we have those in the lab...

[gundralaa]

I'd like to note that section 3.2.3 of the sdk datasheet is dedicated to using the PIO and DMA to capture and store GPIO pin data and act as a logic analyzer. Could be a potential extension of the probe firmware to perform this task in addition to its other uses.