Add laziness to get()

The goal is to create empty objects (no API called) but give access to
the managers. Using this users can reduce the number of API calls but
still use the same API to access children objects.

For example the following will only make one API call but will still get
the result right:

gl.projects.get(49, lazy=True).issues.get(2, lazy=True).notes.list()

This removes the need for more complex managers attributes (e.g.
gl.project_issue_notes)

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