[ColossalChat] Add PP support (#6001)

* support pp training

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* update rm

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* refactor

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* update test case

* fix

* change to 4

* fix eval

* test

* add pp

* hotfix

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* support pp training

* update rm

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* refactor

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* update test case

* fix

* change to 4

* fix eval

* test

* add pp

* hotfix

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* update

* skip pp eval

* update all reduce

* update sft

* update ignore

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* update no cache

* add eval

* remove fi

* remove debug

* remove parentheses to avoid warning

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* Revert "add eval"

This reverts commit 3ab2f6fa329b6d12959fb3c668d278b4b225c5f0.

* add all reduce

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>