Update USB library

[mikee47]

This PR fixes USB support for ESP IDF 5.2. Note that host mode is still not yet supported for esp32sx.

Improvements:

• Update to tinyusb master
• Move initialisation code into separate Arch source file, patch to support ESP32 IDF 5.2 (not yet in tinyusb upstream)
• Add CI support (speeds up library testing)

Fixes:

• Lazy-initialise flush timer: Causes problems with static Device objects and esp32sx as timer's aren't yet initialised
• Enable python UTF8 mode for usbconfig tool (Windows)
• UsbSerial conditional on CDC
• Don't implement descriptor callbacks unless building for device
• Ensure HID device is ready when sendReport called: get div-by-zero exception on esp32s2 otherwise
• Fix Basic_IFS sample with ENABLE_USB_STORAGE: only for rp2040, no host support yet for esp32sx

Tested with rp2040, esp32s2.