DOC: Add gallery example to show usage of map roses

[michaelgrund]

Description of proposed changes

This PR adds a gallery example to show the usage of map roses.

Preview:

https://pygmt-dev--4010.org.readthedocs.build/en/4010/gallery/embellishments/map_roses.html

Reminders

• Run make format and make check to make sure the code follows the style guide.
• Add tests for new features or tests that would have caught the bug that you're fixing.
• Add new public functions/methods/classes to doc/api/index.rst.
• Write detailed docstrings for all functions/methods.
• If wrapping a new module, open a 'Wrap new GMT module' issue and submit reasonably-sized PRs.
• If adding new functionality, add an example to docstrings or tutorials.

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[yvonnefroehlich]

Cool - will look at the plots in detail later on.

But just want to mention that there is an issue suggesting to implemente a high-level methods for plotting a directional rose etc. at #2831 (similar to plot / plot3d at #2797). Not sure if there is any progress at the moment, but would be good to check to avoid double work 🙃. As the script contains various plots, it looks like you put already some work into this PR.

[seisman]

But just want to mention that there is an issue suggesting to implemente a high-level methods for plotting a directional rose etc. at #2831 (similar to plot / plot3d at #2797). Not sure if there is any progress at the moment

It's still waiting for the new alias system.

[seisman]

Instead of plotting eight roses in eight subplots, maybe it's better to plot eight roses in a single basemap?

[yvonnefroehlich]

Suggested change

	Directional map roses
	=========
	Directional map roses
	=====================

[yvonnefroehlich]

Suggested change

	# Fancy, 2.5 cm wide rose of level 2 abels indicating the different
	# directions
	# Fancy, 2.5 cm wide rose of level 2 and labels indicating the different
	# directions

[yvonnefroehlich]

Suggested change

	# Fancy, 2.5 cm wide rose of level 3 abels indicating the different
	# directions
	# Fancy, 2.5 cm wide rose of level 3 and labels indicating the different
	# directions

[yvonnefroehlich]

Suggested change

	- position: **g**\|\ **j**\|\ **J**\|\ **n**\|\ **x**. Set the position
	- position: **g**\|\ **j**\|\ **J**\|\ **n**\|\ **x**. Set the position

[seisman]

@michaelgrund @yvonnefroehlich I've opened PR #4025 which adds the Figure.directional_rose method. With that feature added, this gallery example can be greatly simplified. So better to focus on that PR first?

[michaelgrund]

@michaelgrund @yvonnefroehlich I've opened PR #4025 which adds the Figure.directional_rose method. With that feature added, this gallery example can be greatly simplified. So better to focus on that PR first?

Great, will wait until #4025 is merged!