An Implementation for Godot 4.1.2

[zhangjt93]

I have implemented an imposter plugin that is compatible with Godot 4.1.2 version.

https://github.com/zhangjt93/godot-imposter

I would like to express my appreciation for your project, as it has been of great help to me, especially the shader part. I have reused some of your code for that.
Due to significant differences between the Godot 4. x and Godot 3. x versions, I have made several adjustments and refinements.
If you have any plans to work on migrating your project to the Godot 4. x version, I hope this implementation can be of assistance to you.
I also welcome you to directly build upon this project for your own work.