feat: Add an initial changelog config

[sentrivana]

Description

Craft will support generating changelogs from PR labels in getsentry/craft#628. Add an initial config for our repo.

Issues

Reminders

• Please add tests to validate your changes, and lint your code using tox -e linters.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.01%. Comparing base (eb98edf) to head (eb6f465).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@ Coverage Diff @@## master #5145 +/- ## ========================================== + Coverage 83.98% 84.01% +0.03%  ========================================== Files 180 180 Lines 18225 18225 Branches 3236 3236 ========================================== + Hits 15306 15312 +6 + Misses 1928 1922 -6  Partials 991 991 

see 4 files with indirect coverage changes

[alexander-alderman-webb]

Nice!

I worry that we have many tags that we don't use, but that's a separate discussion.