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Closes #172
This PR proposes the introduction of a Backend System for ImPlot3D. Currently, depth sorting is performed on the CPU at a per-triangle level (Z-sorting), which is computationally expensive for large datasets and fails to resolve visual artifacts when triangles intersect or overlap complexly. By supporting a dedicated OpenGL Backend, ImPlot3D can leverage the GPU's hardware depth buffer (Z-buffer) for per-pixel depth testing, ensuring perfect intersections and significantly higher performance. When no backend is initialized, ImPlot3D should fall back to CPU Z-sorting.
It is important that if the OpenGL backend is not set, ImPlot3D should fallback to rendering lines/triangles/marker just like before using the ImGui's draw list.