New tip shape :class:.StealthTip, allow specifying tip shape of :class:.NumberLine

[behackl]

This adds a new and somewhat more fancy arrow tip shape, StealthTip, inspired from the corresponding TikZ arrow tip.

This PR also allows properly propagating the tip shape to Axes and Numberline.

Reviewer Checklist

• The PR title is descriptive enough for the changelog, and the PR is labeled correctly
• If applicable: newly added non-private functions and classes have a docstring including a short summary and a PARAMETERS section
• If applicable: newly added functions and classes are tested

[behackl]

@MrDiver what is the proper way to typehint with Type?

from typing import Type

tip_shape: Type[ArrowTip] | None = None

or something along these lines?

[MrDiver]

@MrDiver what is the proper way to typehint with Type?

from typing import Type

tip_shape: Type[ArrowTip] | None = None

or something along these lines?

This is fine like it is, theres not really a different way to type Type

Already taken care of