[MNT]: Terminology: artist property

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### Summary

Matplotlib uses "property" as a technical term for aspects of an Artist that can be queried using a `get_()` method. This is confusing because *property* has a dedicated meaning within python. Examples:

https://matplotlib.org/devdocs/api/_as_gen/matplotlib.artist.Artist.properties.html

> Return a dictionary of all the properties of the artist.

https://matplotlib.org/devdocs/api/_as_gen/matplotlib.artist.Artist.set.html:

> Set multiple properties at once. Supported properties are

### Proposed fix

I think our properties are older than python's, but we can't make them change :stuck_out_tongue_winking_eye:. I therefore propose that we use a different term in our documentation. Suggestion: *artist property*.

Inspired by #22451.

Start with the documentation for matplotlib.artist.Artist.properties and Artist.set linked in the issue, then search the documentation for uses of “property” referring to Artist properties. The work is done when those references consistently use the chosen terminology without changing Python’s technical meaning.

Written by the indexing model from the issue text.