[shardformer] Support customized policy for llamav2 based model with HybridParallelPlugin (#4624)

* Enable policy assignment in HybridPlugin and enable llama policy for llamav2

* Remove Policy from Plugin

* revert changes of plugin

HybridParallelModule

* revert changes in plugin

* upgrade transformers

* revert transformers version

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Co-authored-by: flybird11111 <1829166702@qq.com>