[Feat] Add xAI grok-beta to code

[lingyielia]

Description

xAI is not officially supported by Langchain yet. But it can just piggyback ChatOpenAI.

This might be slightly confusing when using in Jupyter notebook.
In UI it's simple.

Screenshot

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[maxschulz-COL]

ChatGPT just suggested me this:

import re

def strip_markdown(v):
    # Strip leading and trailing markdown code block delimiters if they exist
    return re.sub(r"^```(?:python\n)?|```$", "", v).strip()

or

def strip_markdown(v):
    if v.startswith("```python\n"):
        v = v[len("```python\n"):]
    elif v.startswith("```\n"):
        v = v[len("```\n"):]
    if v.endswith("```"):
        v = v[:-3]
    return v.strip()

Maybe better?