Misc: add pyproject.toml

Misc: add pyproject.toml

This file provides the metadata of what versions of python are required
to run `make check` and tests[1]. The required versions of python will
also inform `black` for choosing which syntaxes and linting formats to
use[2].

An additional section for the `black` linter[3] is provided. While
empty, it allows `blacken-mode`[4] for emacs to use the
`blacken-only-if-project-is-blackened` setting.

References
==========
[1]: https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#python-requires
[2]: https://black.readthedocs.io/en/stable/usage_and_configuration/the_basics.html#t-target-version
[3]: https://black.readthedocs.io/en/stable/usage_and_configuration/the_basics.html#where-black-looks-for-the-file
[4]: https://github.com/pythonic-emacs/blacken

Change-Id: I07765dbd088059f336d278a6212ac8d4ee87c79d
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>