feat: add w5500 driver #788
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This adds a driver for the w5500 ethernet chip:
https://docs.wiznet.io/img/products/w5500/W5500_ds_v110e.pdf
While it uses interrupts, it does not use the interrupt pin as there is currently no way to implement a timed wait (something akin to a Futex). For this reason it is not as fast as it could be.
It also does not attempt to tackle DNS, just copping out and allowing the user to set a resolver when they configure the device.
I tried to abide by your Driver guide, let me know if anything is amiss.