community: Add ChatGLM3 (#15265)
Add [ChatGLM3](https://github.com/THUDM/ChatGLM3) and updated
[chatglm.ipynb](https://python.langchain.com/docs/integrations/llms/chatglm)
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Co-authored-by: Bagatur <baskaryan@gmail.com>
Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>
