[pygobject] (4 commits) Created branch wip/gio-async-awaitable-return

[Benjamin Berg <bberg src gnome org>]

The branch 'wip/gio-async-awaitable-return' was created.

Summary of new commits:

  93a41a6... async: Add a new async type that is an awaitable for a _fin
  452bf24... cache: Resolve and store information about async functions
  015f60f... closure: Marshal async callback handler if a default value 
  edf4275... invoke: Create async helper when needed and marshal it for