ASGI app implementation

[DrPyser]

Description

Django channels implements the ASGI spec. Many other frameworks also implement that spec, and any ASGI-compliant "app" can be mounted as part of another ASGI app(though usually framework-specific integrations are created to better exploit framework-specific features).

Recent versions of django channels and Starlette implements ASGI 3.0.

An ASGI implementation should enable integration with django-channels, starlette(and starlette-based frameworks) and any other asgi-based frameworks.