Improve build and publish process

[Elliot-Alexander]

Describe the solution you'd like

• Enforce conventional commits standards for commits merged to main using commitlint
• Use semantic release to automatically calculate the version, tag and publish the built package.
• Use tags to maintain the version and update the package.json version only in the published version - this prevents issues with pushing back to main from the CI and prevent security issues by allowing pushes directly to main.
• Allows us to automatically add a structure changelog to the GitHub release (using commit scopes)

Describe alternatives you've considered

• Could also just automatically tag each merge to main and trigger publishing by using GitHub releases - but this will require more manually work and is less 'semantic' I guess