USB HID Support on Pico!

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Jean-Philippe_Rey
It seems that on Windows, if there is more than one interface descriptor within a configuration descriptor, the latter should include a IAD (Interface Association Descriptor).
```
[Device Descriptor]
[ConfigDescriptor]
[Interface Association Descriptor]
[Interface Descriptor] (1)
[EndPoints Descriptors and so on..]
[Interface Descriptor] (2) 
[EndPoints Descriptors and so on..]   
```
I don't see any IAD in usbd_cdc_hid.c. Maybe this could do the trick in order to allow windows to enumerate this CDC-HID config.

That said, I don't know if IAD are recognized in Linux and macOS

I am exploring USB enumeration with STM32F4DISCO. I will give feedback here in case of positive results.

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