add rag&full-context function from mem0

[CSLiuPeng]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (does not change functionality, e.g. code style improvements, linting)
• Documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

Please delete options that are not relevant.

• Unit Test
• Test Script (please provide)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have checked my code and corrected any misspellings

Maintainer Checklist

• closes #xxxx (Replace xxxx with the GitHub issue number)
• Made sure Checks passed

[CSLiuPeng]

add mem0_rag&full-context code to our project

[Ki-Seki]

@CSLiuPeng

Please revise this PR's title. Next time, if you need a review from someone like @Duguce, you can mention them directly.

[Duguce]

@CSLiuPeng 感觉还需要更新一下示例的配置文件，以及可以跑通整个rag流程的bash脚本；另外在evaluation文件夹下的readme中补充一些rag评估相关的使用说明，并尝试在本地运行一下，确保能跑通

[CSLiuPeng]

get it

[Ki-Seki]

@CSLiuPeng Will this PR be updated?