blflash 0.3.3

BL602 serial flasher.
Documentation
# blflash


BL602 serial flasher

Inspired by https://github.com/esp-rs/espflash, https://github.com/bouffalolab/BLOpenFlasher

ISP documentation: https://github.com/bouffalolab/bl_docs/tree/main/BL602_ISP

## TODO


- [x] Flash protocol
- [x] Generate Partition bin
- [x] Generate boot info with compiled bin
- [ ] Generate dtb bin