different mesh way(s), any comment?

[yuedajiong]

graphdeco-inria/gaussian-splatting#540

copy and paste:
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add regulirization items, force: a) algin points to surface, b)flatten every point。 (refer: SuGaR https://arxiv.org/abs/2311.12775)

learn a mapping fucction, mesh = f_gs_to_mesh(gs_points_convergent, [cameras_in_trainset, target_images_in_trainset])
on this direction, I suppose we can learn the regular pattern(intuitively, there should be), that is better than a hard-code algorithm(maybe difficult) which do the mapping.i
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