Implement the ability to adjust the z-index of elements

[samuelleme]

It would be very useful to be able to define the order of the elements on the z-axis. The idea is to have four options:

1 - Move 1 forward
2 - Move 1 backward
3 - Move to first place
4 - Move to last place

[send-me-a-ticket]

simply use https://github.com/Zachatoo/obsidian-canvas-send-to-back
obsidian://show-plugin?id=canvas-send-to-back