Read input from a USB keyboard connected to the Raspberry Pi Pico Micro-USB port, via an OTG cable

Based on code from https://github.com/raspberrypi/pico-examples/tree/master/usb/host/host_cdc_msc_hid and https://github.com/No0ne/ps2pico

Note: the HC-05 board is just serving as a raw bluetooth serial console