PR Summary

When ax.arrow() is called, a FancyArrow object is being added to the current axes as an artist and not a patch. So when autoscale_view is called, which loops through all Patches and scales the view based on the minimum and maximum of those, the FancyArrow isn't being considered.
The solution is a two-step process. First, we have to add the arrow as a Patch, and second, we have to lazily call autoscale_view() after adding it on the axes.

Part of a course at University of Toronto with @atafliovich.

Resolves #12712
Takes over #13788

PR Checklist

• Has Pytest style unit tests
• Code is Flake 8 compliant
• New features are documented, with examples if plot related
• Documentation is sphinx and numpydoc compliant
• Added an entry to doc/users/next_whats_new/ if major new feature (follow instructions in README.rst there)
• Documented in doc/api/api_changes.rst if API changed in a backward-incompatible way