* WIP, add VI-LayoutXLM
* fix pybind
* update the dir of ser_vi_layoutxlm model
* update dir and name of ser_vi_layoutxlm model
* update model name to StructureV2SerViLayoutXLMModel
* fix import paddle bug
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Co-authored-by: DefTruth <31974251+DefTruth@users.noreply.github.com>