make_image: support ESP32 image format (ESPTOOL-946)

[sven337]

This change adds ability to generate ESP32 firmware images with make_image. This had been requested a long time ago and not implemented, but I found use for that feature.

This change fixes the following bug(s):

https://github.com/espressif/esptool/issues/178

I have tested this change with the following hardware & software combinations:

ESP32-WROOM-32D firmware: dumped, extracted, rebuilt with make_image. This change will not preserve the flash flags, but these can be manually added.

I have run the esptool.py automated integration tests with this change and the above hardware:

NO TESTING

[github-actions[bot]]

Warnings

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👋 Hello sven337, we appreciate your contribution to this project!

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[dobairoland]

Please see the note at https://docs.espressif.com/projects/esptool/en/latest/esp8266/esptool/advanced-commands.html#assemble-a-firmware-image-make-image:

In general, it is better to create an ELF image (including any binary data as part of the ELF, by using objcopy or other tools) and then use elf2image to generate the .bin file.

make_image was only supported for ESP8266 and it was deprecated after that in favor of elf2image. This command will be probably removed in the next major release of esptool.

I'm sorry but we will not accept this PR.

[sven337]

Please do not remove it, this is a useful feature. This patch trivially adds support for ESP32, I don't understand what could justify refusing it. elf2image requires an ELF file but you do not always have that if you're editing segments directly.