skip uninteresting files during debugging

[shazron]

https://code.visualstudio.com/docs/nodejs/nodejs-debugging#_skipping-uninteresting-code

Use the fixture below to test, then:

1. add to the template here https://github.com/adobe/generator-aio-app/blob/master/generators/add-vscode-config/index.js
2. update this fixture code https://github.com/adobe/generator-aio-app/blob/master/test/__fixtures__/add-vscode-config/launch.json
3. Update the docs at https://github.com/AdobeDocs/app-builder/pull/333

[aiojbot]

JIRA issue created: https://jira.corp.adobe.com/browse/ACNA-2992

[shazron]

See #87