Test flashing with Adafruit TinyUF2 bootloader on ESPxxx devices

[Josverl]

The S3 also supports "Touch 1200" speed toggle to enter the bootloader .
Adafruit TinyUF2 bootloader

• build / flash bootloader
  https://github.com/adafruit/tinyuf2/tree/master/ports/espressif#flash
• add cli to override flash method ; --type uf2 ?
• update download to
  • download .uf2
  • or convert .bin to .uf2 on the fly
• test flash

with mpflash you can flash using :
mpflash flash --board ESP32_GENERIC_S3 --bootloader touch1200 
https://github.com/Josverl/mpflash

Originally posted by @Josverl in micropython/micropython#17525 (comment)