feature: Support for accessors

[znicholls]

Is your feature request related to a problem? Please describe.

If you document accessors, there isn't an obvious solution for how to show the namespace in which the accessor ends up in (as opposed to the original API). In the sphinx world, there is a package dedicated to handling this situation: https://github.com/xarray-contrib/sphinx-autosummary-accessors

Describe the solution you'd like

A similar thing for the mkdocs universe.

Describe alternatives you've considered

Additional context

I have written such an extension here: https://github.com/climate-resource/mkdocstrings-python-accessors. As you can see, it is super basic, but it seems to do what I want (see an example at the bottom of this page , with built docs here (note the namespace which is documented)).

[znicholls]

Sorry, made this from the wrong account, see #230 instead