The documentation has been enhanced to describe the verification of firmware with the firmware updater. Examples have also been provided that describe how keys can be generated and how firmware can be signed.
* Remove traits section now that we have embedded-hal-async and refer to
it.
* Explanation that embassy is multiple things.
* Bootloader description image
* Less generics on bootloader. Keep PAGE_SIZE as a common multiple of
DFU and ACTIVE page sizes.
* Document restriction
* Add unit tests for different page sizes
* Add flash drivers for L0, L1, L4, WB and WL. Not tested for WB, but
should be similar to WL.
* Add embassy-boot-stm32 for bootloading on STM32.
* Add flash examples and bootloader examples
* Update stm32-data
