feat(codeactions): add code actions for updating namespace and voc validation

[dselman]

Changes

• Code action to update the namespace in a model file, updating all imports and vocabulary files
• Find references to find all declarations that reference a concept
• Validation of vocabulary files
• Update VSCode version and other dependencies
• Check that extension runs locally in chrome using npm run chrome
• Add a stub unit test

Flags

• See code comments for limitations when editing voc and cto files.

Screenshots or Video

Related Issues

• Issue #
• Pull Request #

Author Checklist

• Ensure you provide a DCO sign-off for your commits using the --signoff option of git commit.
• Vital features and changes captured in unit and/or integration tests
• Commits messages follow AP format
• Extend the documentation, if necessary
• Merging to master from fork:branchname