GitHub Discussions

I was exploring about `pytest`, and accidentally found out that [pytest uses GitHub Discussions feature](https://github.com/pytest-dev/pytest/discussions).

Seems to be a New Thing™ as it still has a "Beta" marking in [the GitHub documentation](https://docs.github.com/en/discussions).

I see it as a good way to start discussing things without necessarily increasing the number of open issues.

What do you think? Should we try activating it? (I don't have enough privilege to activate that feature; I see no option to enable it when I clicked on the [Settings tab](https://github.com/aio-libs/aiosmtpd/settings)).