Implement packaging and publishing steps

[shankarpandala]

Now that tests are in place (issue #527), we need to implement proper packaging and publishing for our VS Code extension:

1. Fixed the cb.apply is not a function error when running npx vsce package by:

   • Installing @vscode/vsce instead of vsce
   • Adding packaging scripts to package.json

2. Updated package.json with mandatory fields:

   • Added repository field
   • Added homepage and bugs fields
   • Added license field
   • Added keywords
   • Fixed path to main extension file

3. Created supporting files:

   • Added README.md with usage instructions
   • Created CHANGELOG.md file
   • Added extension icon

4. Created validation script that checks:

   • Required package.json fields
   • README and CHANGELOG existence
   • Icon file availability

5. Successfully generated .vsix package file

Status: Closed - All packaging implementation is complete and working.