Release v0.2.1

Release v0.2.1 with changes since v0.2.0

• Release v0.2.1 e6b5f30
• update to node 18 5913235
• Add CODE_OF_CONDUCT.md to the repository and update reference. 10e5398
• [ci] add a job to publish the extension to the Visual Studio Marketplace 27b4f7c
• perform yarn upgrade 37fd531