Add watchdog component

[nateinaction]

Partially completes #27

Original acceptance criteria:

• Initialize the WDT_WDI pin in a LOW state
• Drive the WDT_WDI pin HIGH for a 100ms (arbitrary amount of time) pulse
• Ensure the watchdog is pet at least every 20 seconds
• Log if the watchdog petting is slipping from real time (i.e. other software components are slowing down and causing this component to be late)

Delivered:

Roughly every 100ms the watchdog pin is toggled on for 100ms. Telemetry is emitted every time the pin is toggled on.

Not delivered:

• Ensure the watchdog is pet at least every 20 seconds
  • Reason: There is an issue on the v4b board that causes the watchdog to trigger roughly every 1 second, on the v4b board the watchdog triggers roughly every 5 seconds
• Log if the watchdog petting is slipping from real time (i.e. other software components are slowing down and causing this component to be late)
  • Reason: I don't think we can do this without the RTC implementation

[Lex-ari]

Looks good! Amazing work 🚀

[Mikefly123]

IMG_4293.mov

Looks good to me as well! I was here with Alex and we verified it works with V4c FC Boards (and by proxy should be good on V4b as well). I think it should be no problem to bounce the timing features to a future issue ticket!