[feat] Support prompt level dynamic (#6300)

* adjust to dynamic prompt bs

* remove debug

* update pad seq (#6303)

Co-authored-by: Tong Li <tong.li35271158@gmail.com>

* adjust to dynamic prompt bs

* remove debug

* fix dp issue

* fix

* fix default settings

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Co-authored-by: Tong Li <tong.li35271158@gmail.com>