Add debug launch conf for VS Code

[balloob]

Breaking change

Proposed change

• Add VSCode tasks to launch the develop scripts for App, Cast, Gallery, Demo.
• Add VSCode launch config to open a debug session in Chrome. Will launch the appropriate develop script if it is not running and will wait until the first build is done.

It's not useful… yet. Somehow Chrome will always not disable network caching when dev tools open, even if the default is to do so.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue or discussion:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io