perf: optimize editor->IMGUI

[yyc-git]

TODO use ImGui.ShowMetricsWindow() to show debug

description run the editor is slow

reason now even run the simplest editor(Scene View + Game View), GPU will take 8ms in each frame. the imgui cost GPU

solution 1.reduce ui size e.g. reduce window size which are overlay by upper ui controls

but this lead only a litter increase fps

2.optimize imgui refer to: Performance improvement suggestion https://community.intel.com/t5/Intel-oneAPI-Data-Parallel-C/Optimizing-Performance-and-Memory-Usage-in-ImGui-based/td-p/1464228 Could ImGUI Be the Future of GUIs?

TODO optimize Scene/Game View?

3.imgui use webgpu backend

/* 4..use UIElements refer to: https://blog.csdn.net/u010019717/article/details/102540067 https://www.slideshare.net/unity3d/built-for-performance-the-uielements-renderer-unite-copenhagen-2019

*/