Feat (optimizer): split zero tensor

[li126com]

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Motivation

Base commit id of develop: b024cf4

当前是构建了一个全新的optimizer在hybrid_zero_optim.py，原来的optimizer实现放在了hybrid_zero_optim2.py用于对照。store.py内的各种store暂且均替换为新实现。

功能实现及精度对齐：

• dp
• tp
• pp
• fsp and msp
• isp
• zero1.5
• overlap param
• overlap grad
• moe
• checkpoint

Modification

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BC-breaking (Optional)

Does the modification introduce changes that break the backward compatibility of the downstream repositories?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

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Checklist

Before PR:

• Pre-commit or other linting tools are used to fix the potential lint issues.
• Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
• The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, like docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with those projects.
• CLA has been signed and all committers have signed the CLA in this PR.