chore: Add various GitHub features for better open source maintenance

QoL + Misc features to add to make the OSS experience of this repo better:

[ ] Proper labels
[ ] Changesets
[ ] Enforce commit/issue/pr styles (namely, titles should always have chore/feat/bug/... in the start, per https://www.conventionalcommits.org/en/v1.0.0-beta.2/)
[ ] CI/CD flows, preview env support(?), etc.
[x] code owners (me)
[ ] Everything in community standards (insights tab)

Wundero / practimations