Automatically erase or repair NVS partition if corrupt

[kasperl]

Jaguar doesn't behave very well if the NVS partition becomes corrupt. We've seen it fail in the flash_kv_init primitive, so maybe we can catch that error and clear the NVS partition? Maybe that is too much, but let's consider it.

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My guess would be that somehow the NVS partition has become corrupt. Maybe Jaguar needs to handle that and erase the partition? Or maybe it should report it in a nicer way so it is possible for the user to erase the flash manually.

Originally posted by @kasperl in toitlang/toit#458 (comment)

[floitsch]

In the meantime here are work-arounds to get into a good state again:

According to https://esp32.com/viewtopic.php?t=15530 calling idp.py -p PORT_NUMBER erase_flash should erase the NVS Flash.

Alternatively one could write the following Arduino program and run it:

#include <nvs_flash.h>

void setup() {
  nvs_flash_erase();
}

void loop() {
  delay(3000);
}