feat(@schematics/angular): add VS Code configurations when generating a new workspace

[alan-agius4]

When generating a new workspace we now generate several VS Code configurations.

• extensions: we added config to recommand to use official VS Code extensions.
• launch: added run and debug launch scripts for ng test and ng serve
• tasks: configured npm start and npm test to better support the launch scripts

More information about each files can be found

• extensions: https://go.microsoft.com/fwlink/?linkid=827846
• launch: https://go.microsoft.com/fwlink/?linkid=830387
• tasks: https://go.microsoft.com/fwlink/?LinkId=733558

Closes #2672

[dgp1130]

LGTM. I assume we don't want to migrate existing projects since they may already have their own configuration and may not want such a configuration if they don't use VSCode.

Should we consider an optional migration for those than want to update or "canonicalize" their debugging configuration in existing projects?

[alan-agius4]

Should we consider an optional migration for those than want to update or "canonicalize" their debugging configuration in existing projects?

I don’t feel too strongly about this, but we can surly do an optional migration if we think it will be useful.

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