Add figureoptions to the Tk backend

[BenediktO]

Problem

It would be great if there was a dialog in the Tk backend similar to the figureoptions module of the Qt backend.
This would make it really easy to configure plots when embedding in Tk GUIs.

Proposed Solution

In backend/qt_editor/figureoptions.py most of the work is already done.
One would have to "only" implement a class equivalent to FormDialog in backend/qt_editor/_formlayout.py and the needed widgets.
Is anything in this direction planned?
I am willing to contribute to this feature.

[jklymak]

My strong preference would be for such tools to be standalone projects. I suspect these days the qt version would also have been a standalone. The reason is that they accrue inconsistencies and require maintenance, and are hard to test. Hence they really require someone to take ownership.

[anntzer]

I am personally not opposed to adding a tk version of formlayout (but you'll have to be the one writing it). I find figureoptions extremely useful, and it's a pity it's not available to other backends.
To keep things maintainable, I'd say it should try to match the formlayout as much as possible, so that the matplotlib side of things stays the same.

[github-actions]

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