Investigate espflash library usage

[MabezDev]

We don't have much from crates.io rev deps, but what we can, and should do is do a code search on Github/Gitlab to find library usage. From here, we can find what needs to be exposed in the library and what doesn't. It's also not that black and white, a module may be used because our other APIs are insufficient, or are tangled together forcing users to use both modules so keep that in mind.

[jessebraham]

A few projects which appears to be using espflash directly as a library:

• https://github.com/probe-rs/probe-rs/
• https://github.com/yanshay/esp-hal-app
• https://github.com/EyeTrackVR/FirmwareFlashingTool
• https://github.com/ivmarkov/espfactory
• https://github.com/3STechLabs-org/ESP32-Flasher
• https://github.com/QTShock/QTHub

This is not comprehensive, but investigating how these projects are using the library should at least give us a reasonable idea of how people are currently using espflash.