feat: changelog auto-generation github workflow

[Nimja1234]

Automatically generates changelog based on commit history. Initiated when a new tag is created, so will update existing CHANGELOG.md when a new tag is created and add commit history since last tag.

Information it includes is based on if the commits follow good commit convention (feat: , fix: , chore: , etc.). Drastically reduce work needed to maintain changelog going forward.

Closes #510