Upgrade to langchain-0.1.0

[JasonWeill]

Problem

LangChain 0.1.0 is now available, the first version of LangChain after the 0.0.x series. Starting with 0.1.x, semantic versioning means that a patch release is not necessarily a breaking change.

LangChain 0.0.350 has a constraint on openai version 0.x, meaning that our fix for #543 is failing in its conda-forge feedstock (conda-forge/jupyter-ai-feedstock#12) despite the fix working locally. Jupyter AI 2.9.0 is available on PyPI (to install using pip) but not on Conda-Forge (to install using conda). In Conda-Forge, LangChain 0.1.0 is constrained to openai 1.x.

Proposed Solution

Upgrade Jupyter AI to use LangChain 0.1.x. Upgrade any other dependencies.

Additional context

[JasonWeill]

After upgrading to LangChain 0.1.0, and also upgrading to langchain-core>=0.1.7,<0.2, loading the chat UI produces an unhandled error similar to that seen in #555, fixed in #558 by @dlqqq:

[W 2024-01-08 16:27:11.251 ServerApp] wrote error: 'Unhandled error'
    Traceback (most recent call last):
      File "/opt/miniconda3/envs/jupyter-ai-jl4/lib/python3.11/site-packages/tornado/web.py", line 1784, in _execute
        result = method(*self.path_args, **self.path_kwargs)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/opt/miniconda3/envs/jupyter-ai-jl4/lib/python3.11/site-packages/tornado/web.py", line 3290, in wrapper
        return method(self, *args, **kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/Users/jweill/git/jupyter-ai/packages/jupyter-ai/jupyter_ai/handlers.py", line 305, in get
        ListProvidersEntry(
      File "/opt/miniconda3/envs/jupyter-ai-jl4/lib/python3.11/site-packages/pydantic/v1/main.py", line 341, in __init__
        raise validation_error
    pydantic.v1.error_wrappers.ValidationError: 1 validation error for ListProvidersEntry
    name
      str type expected (type=type_error.str)