Replace ~ in JS module names

[rpmchale]

Is your feature request related to a problem? Please describe.
My company uses a centralized access management system to validate a user is authorized to view websites. The system rejects any requests going to URL's containing the tilde character. This prevents all dependencies with names like async~xxx from loading.

Describe the solution you'd like
Is it possible to replace the tilde with a different character such as underscore ( _ )?

Describe alternatives you've considered
We don't have many other options as the framework defines the dependency imports. We'd likely not be able to use dash if the naming convention async~xxx continues.

[rpmchale]

Moving to dash_core_components