Implement Raspberry5Driver and board

[krwq]

We should investigate if it makes sense to implement Raspberry 5 driver and board. We should investigate:

• perf differences
• other features between our libgpiod implementation and RPi4 direct implementation

and do the same for RPi5 and figure out if it makes sense to implement it. If the perf is similar we might want to decide to not do this.

Ref: #2262

[Ellerbach]

[Triage] Removing the untriage and commenting for the bot not to add it again :-)

[rjhind]

Most of the issues I've seen here suggest using gpio chip 4 with the GPIOD driver on Raspberry Pi 5s. I've just set up some 5s with the latest version of Raspbian and the GPIO is on chip 0 not chip 4? So I have to set up the GPIO controller using:

using var gpio = new GpioController(PinNumberingScheme.Logical, new LibGpiodDriver(0));

Is this a change in recent versions of Raspbian?