feat: add USB CDC support, ReadFlash, and ESP32-S3 post-connect#22

jgangemi wants to merge 1 commit intotinygo-org:maintinygo-org/espflasher:mainfrom

jgangemi:jae/upstream-usb-cdcjgangemi/espflasher:jae/upstream-usb-cdcCopy head branch name to clipboard