Boot messages are lost due to tinyUSB detaches (to write boot log and secrets if required). It would be nice if they were buffered / displayed later

[tyeth]

As part of the PR to fix file system corruption when devices brownout, I've decided to split off this piece of work that would buffer log output until usb serial is reattached. This is a ticket for that work.

[tyeth]

Side quest, the SAMD (m4 airlift) seems to be truncating the initial bit of the device info in serial, the firmware version line gets the label merged with Adafruit WipperSnapper line from the parent calling method, and the title ------Device Information--- is lost completely. I tried adding flushing but no difference.

EDIT - Future me: try adding yield to debug print as well as flush, as it gives tinyusb cdc a kick too.