enable configuring the bInterval on hid devices

[koltenpearson]

In the process of creating a usb keyboard using the pi pico, I was not able to match the amount of HID reports that the qmk firmware could send, and eventually tracked it down to the bInterval of the qmk firmware being 1, while this one defaults to 8.

So yeah, this will let us configure it, rather than having it hardcoded

[andrewleech]

Good find, yes this interval controls the rate of messages sent to the host which can affect the responsiveness of the hid device.

Do you think a comment on the line or brief description elsewhere would help others understand what this does? I know lots of other things here aren't particularly documented either though...

Regardless there's a ci failure noting the commit message needs a little fixup to match standard project guidance.

[koltenpearson]

Finally got it happy with the commit message. I added a small comment as well

[dpgeorge]

I suggest calling this new parameter just interval. The "b" means it's a byte (ie maximum 255) and I don't think that adds any value here. Using interval matches the style of the other parameters here.

(Other bits of the lower-level code use bInterval with an uppercase I, but this here is a higher-level API and I think interval is best here.)