GPIO: Implement common traits

[playfulFence]

From esp-hal API Guidelines:

• Where the guidelines suggest implementing Debug, defmt::Format should also be implemented
  • Event, WakeEvent, GpioRegisterAccess, all the structs (screenshot attached below).
    From Rust APU Guidelines:
    C-COMMON-TRAITS ("to be implemented" are listed):
• enum GpioRegisterAccess: defmt::Format, Debug, Eq, PartialEq
• enum Event, WakeEvent: Debug, Eq and PartialEq (questionable),
• all the structs
  

Of course, that can still be discussed!

#2492