allow user to supply his own secure boot/flash encryption keys

[runny4184]

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Proposed Feature

allow user to supply his own secure boot/flash encryption keys

Is your feature request related to a problem?

user may have already efused his board with a boot/flash encryption key

Describe the solution you'd like

Describe alternatives you've considered

How would this improve the user experience?

Implementation Details (Optional)

esp32 should be flashed in development mode to allow upgrading the firmware

Proposed Hardware/Firmware Impact

Additional Context

Visual Aids (Optional)

[lockedmutex]

@runny4184 firmware signing using user's key is something that has to be done without picoforge. While it can be added as a feature on picoforge. I have not yet worked on it due to its fragile nature.