[docs] Use type hints in docs

[cidrblock]

trafficstars

https://github.com/ansible/ansible-navigator/pull/631

Some circular dependencies need to be resolved, the PR above was exploration

[cidrblock]

This was the final approach in the PR: https://www.sphinx-doc.org/en/master/usage/extensions/autodoc.html#confval-autodoc_typehints

[cidrblock]

We no longer publish API docs for navigator