Enable release-drafter in CI

[bjosv]

Enable the release drafter since it was used in hiredis,
and other clients under https://github.com/valkey-io seems keep using it.

[bjosv]

I have no experience in using the release-drafter, so I don't really know if its helpful or if we should write the changelog/release notes ourselves..

[michael-grunder]

I like it personally. My biggest issue was forgetting to apply appropriate labels before merging but that's user error 😅

[bjosv]

Ah, then we use it. I'll just have too look into how its works. Hopefully its possible to apply the labels retroactively before we tag and release.