chore: add semantic release GH action

[easingthemes]

Description

Added 2 new Workflows:

• Release --> semantic-release:
  • Creates release notes
  • Updates CHANGELOG
  • Updates package.json version
  • Creates Git tag/release
  • Publish package to NPM
• Manual Release --> same as Release, but can be triggered manually in Actions tab

Commit messages convention described in /.github/CONTRIBUTING.md

Related Issue

Motivation and Context

How Has This Been Tested?

Tested only with dryRun. Real test requires code update to trigger automated release/tag/changelog updates.

Screenshots (if appropriate):

Types of changes

not code/functionality change, just release process update.

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.

[rbartl-pv]

Thanks @easingthemes for your contribution.