Graph canvas menu

[pythongosssss]

Add menu for canvas controls for zoom in/out/reset view/lock graph

Closes #593

Setting to hide/disable canvas menu:

[mijuku233]

So there will be more and more floating panels? The comfyui front-end is developing in a bad direction. T_T
The canvas that should remain clean is being obscured by more and more floating panels, which is a nightmare

[JorgeR81]

Floating panels look good with small workflows, like the default one.
But it's not convenient for large workflows.

Please make all floating panels optional.
I wouldn't mind having a 2 row Topbar, with all buttons in there.

[qudix]

I don't get this complaint, floating panels take less canvas real-estate compared to a bar that takes 100% horizontal and fixed vertical, even when it only contains a few buttons. I can see adding options to hide optional elements like these, but clearly interfaces like vscode and blender are the inspiration here.

[JorgeR81]

I don't get this complaint, floating panels take less canvas real-estate compared to a bar that takes 100% horizontal and fixed vertical, even when it only contains a few buttons. I can see adding options to hide optional elements like these, but clearly interfaces like vscode and blender are the inspiration here.

I think the issue is not so much about the space we lose, but the fact that floating panels can be distracting, in a node interface.
But the Blender GUI could give some good inspiration on how to deal with this.
I've made a proposal based on that ( #1030 )