Collapse module declarations into "asana" module
Collapse module declarations into "asana" module

- Collapse all module declarations from the declared `Asana` module into `"asana"`
- Fix `Asana.Client.create()` to be static
- Make `Asana.auth`, `Asana.errors`, and `Asana.resources` be modules.

As a test that this works, I added type definitions for `Asana.auth.PopupFlow`.

Thanks @pspeter3 and @vsiao for comments and help!

Asana/api-explorer,Asana/api-explorer