[develop][feature]add a8w4 quant algo · Pull Request !650 · MindSpore/vllm-mindspore

1. [feature]add a8w4 quant algo
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**What type of PR is this?**

/kind feature

**What does this PR do / why do we need it**:
添加a8w4低比特量化算法的权重在线切分策略

**Which issue(s) this PR fixes**:

Fixes #ICGXXF

**Code review checklist [【代码检视checklist说明】](https://gitee.com/mindspore/community/blob/master/security/code_review_checklist_mechanism.md)**:

+ - [ ] 是否进行返回值校验 (禁止使用void屏蔽安全函数、自研函数返回值，C++标准库函数确认无问题可以屏蔽)
+ - [ ] 是否遵守 ***SOLID原则 / 迪米特法则***
+ - [ ] 是否具备UT测试用例看护 && 测试用例为有效用例 (若新特性无测试用例看护请说明原因)
+ - [ ] 是否为对外接口变更
+ - [ ] 是否涉及官网文档修改

类型	指派人员	状态
审查	TronZhang	已完成 (0/0人)
测试	TronZhang	已完成 (0/0人)

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