Add USBHost

[lynxD]

I'm opening new pr since author of previous one has become unresponsive.
Previous PR: #4032

I've rebased code form the previous pr.

This code is WIP.
Currently there are a lot of warnings due to missing doc-strings and the like.

[lynxD]

ControlPipe trait assumes endpoint to be 0, however the spec allows for multiple control endpoints.
https://stackoverflow.com/questions/22417493/what-is-the-use-of-multiple-control-endpoints-non-ep0

This seems to be of limited use but at least the API should allow for it.
Anybody has idea how to handle this best? Add endpoint number parameter to setup method?

[AlexCharlton]

My 2 cents: Non-0 control endpoints are not used in any of the standard device class specs. It's possible that no one who uses this library will ever have a use for such a thing, so I'd prioritize landing this feature rather than developing an interface to meet a theoretical need.

[AlexCharlton]

Here's a commit that restores the ability to compile with the log feature: AlexCharlton@46c9d8c

This fix had been reverted because I had originally added the {:x?} format directive, which evidently dfmt doesn't recognize. I've simply used {:?} instead.

[AlexCharlton]

And another commit that fixes iter_interface: AlexCharlton@4c3afbd

It incorrectly assumed that interface descriptors would always come immediately after config descriptors. Embassy's own descriptor builder may stick an interface association descriptor before any interface descriptors, though. Since the IAD isn't actually needed to parse IDs (and since this iterator is also used to parse configurations from potentially unknown sources), I simply made it so that we skip over any non-interface descriptors, which is also what the previous interface iterator did.

[AlexCharlton]

One additional fix for this branch: AlexCharlton@3ef6a05

get_active_configuration (unlike get_configuration) was requesting a config descriptor that was always equal to the maximum available buffer size. Some devices don't like this and may not respond, so we're limiting the request to be exactly the size of the descriptor.