Allow writing to bootloader segments by modifying MCU's fuses

[rnd-ash]

On Atmel Samd/Same MCU, the bootloader regions are locked. This means that you cannot flash your own bootloader with probe-rs.

Tools like OpenOCD can modify the MCU Fuses like so in order to write to the bootloader region of these controllers:

atsame5 bootloader 0 // Write 0 to bootloader fuse
program bootloader.bin verify
atsame5 bootloader 16384 // Set bootloader size to 16KB

Describe the solution you'd like
Probe-rs can be extended in order to perform this. For now, the only use case for fuse modifying would be to flash the bootloader. With regards to implementation, I could see a couple ways on doing this:

1. Create a new flag for probe-rs that allows for fuse toggling bootloader protection (And thus setting the target size after flash - This would allow for writing a larger bootloader if needed)

2. Modify the default flash process (Read the current fuse state, set it to 0. Write flash, Write back old fuse state) - Maybe let the user pass a flag to probe-rs to acknowledge writing to 'dangerous' flash regions

[bugadani]

In general, the team is hesitant to add target-specific flags. If you can write a flash algorithm that implements 2) we can add atsamdXXXX-with-bootloader targets that execute the modified flash algorithm.