initial nrf52_upload extraction from pc-nrfutil

[daringer]

This PR replaces the nrfutil dependency with an extract from the originating, archived repository.

Changes

• use nk3.bootloader.nrf52_upload instead of nrfutil to upload a signed firmware to a Nitrokey 3 Mini (nRF52)
• avoids importing pc-ble-driver-py
• enables python 3.11 support
• (untested) should enable arm / *bsd support
• adds pyserial & protobuf to dependencies
• comes with the necessary package.py to create firmware images, although it is not used
• applies black & isort to nrf52_upload

Checklist

• tested with Python3.9
• run make check or make fix for the formatting check
• signed commits
• updated documentation (e.g. parameter description, inline doc, docs.nitrokey)

Test Environment and Execution

• OS: Arch
• device's model: nk3am
• device's firmware version: 1.3.0RC1

Fixes #330
Fixes #265

[daringer]

From technical point of view I would say this is fine for an initial working state.
Did not yet test on windows... that's to be done

I added a README.md, maybe you could take a look, if this is ok from license point of view.

• The sources are not in their original state anymore due to black and isort, don't see an issue with this
• How about removing the license notices from each file and replacing them with spdx + the complete license within the parent directory ?
• any other license related things to consider?

[robin-nitrokey]

As we discussed, I’d prefer to have this in a separate package to have a clean separation, otherwise looks good to me.

[daringer]

windows tests still missing before we can merge ...

... separate package: Nitrokey/nrf52-uploader ?

[robin-nitrokey]

Rebased onto master and added flake8 and mypy ignores to fix the CI.