[NEW FEATURE] Flash support for luos_engine core native HAL

[nicolas-rabault]

Until now we avoid the emulation of flash on native HAL. This means that we can't use Luos in bootloader mode on a native target.
Instead of writing binaries on a flash, we could write them on a file, then instead of jumping to another address of the flash to run the application, we could run the downloaded program.
On this native HAL instead of flash addresses, we should have files name allowing us to "jump" from one to another easily.

This could allow us to easily perform advanced test and validation on the bootloader in a native target.
This features will be really useful in the future of Luos allowing to flash computer and embedded nodes using the exact same way.