feat: implement FLC

[WhiteHoodHacker]

Closes #3

[Sandvoxel]

Recommend added example linker file or add some docs to the readme on how to setup the linker file.

[Sandvoxel]

Also I see that you are trying to use the embedded ecosystem so you might want to take a look at https://github.com/rust-embedded-community/embedded-storage

[WhiteHoodHacker]

Recommend added example linker file or add some docs to the readme on how to setup the linker file.

It turns out that the linkage is unnecessary and actually caused some issues, so I am disabling the linkage section header for .flashprog by default.

[WhiteHoodHacker]

Also I see that you are trying to use the embedded ecosystem so you might want to take a look at https://github.com/rust-embedded-community/embedded-storage

I likely won't end up implementing this just because of the nuances of flash management on the MAX78000 (1 -> 0 only bit transformations and large page sizes). Implementing an abstraction that automatically erases an entire page (8192 bytes) would require copying all the previous bytes, modifying them, then writing them back in - this is super expensive.

Users planning to use the flash should be aware of the nuances with the flash controller and use the HAL APIs with care and thought.