Review and test Visual Studio Code extension with client-side-only editors

Goal of this task is to review and test pull request that brings in visual code extension.
Pull-request: https://github.com/kiegroup/kogito-tooling/pull/2/files

Acceptance criteria

• Coverage is reviewed and meets criteria
• Code is reviewed and all questions are answered
• QE understands the code
• Identified non-blocker issues are reported