ci: add automated release management

[mehalter]

This adds the release please github action for making release PRs to automate the release process. It automatically calculates the next version based on conventional commit messages which you are following and will make a release PR while you make commits to main. Once you are ready to do a new release you simply click merge on that release PR and it tags a new release!

This also will maintain a "stable" tag which will always point to the latest release so people who use plugin managers that don't have semantic version tracking can also track versions to some degree.