added example of flashing from python code (ESPTOOL-952)

[brentpicasso]

Example app demonstrating how to flash from python code. Follow up from PR #1022

[github-actions[bot]]

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[radimkarnis]

Hi @brentpicasso, thanks for taking the time to follow up and contribute to the documentation!

We will be refactoring esptool to be easily usable as a Python module in the next major release, so this script will most likely stop working quite soon due to changing APIs. On the other hand, starting with the documentation now won't hurt; this contribution seems like a good start.

I have some issues and suggestions before we can move on. Feel free to say you don't have time for this, in that case, I can take over.

[radimkarnis]

1) The commit name, please see the message from our bot above this comment. The commit type is missing. I suggest something like docs(scripting): Add example of usage as a Python module.

[radimkarnis]

2) New docs page. We already have a page explaining some basic scripting here. I would add this as a new section (e.g. Using Esptool as a Python Module).

[brentpicasso]

Hi, @radimkarnis I ran out of time this week, preparing for some travel. I accept your offer to move it forward! Thank you!