Remove an unnecessary dependency.

[mikolajz]

Title

Remove dependency on importlib_metadata (even on Python 3.8 stdlib works).

Relevant issues

The extra dependency was causing an issue due to another library with lots of strict dependencies.

Type

🐛 Bug Fix 🧹 Refactoring

Changes

[REQUIRED] Testing - Attach a screenshot of any new tests passing locally

For importlib_metadata - even in Python 3.8 this worked:

$ python
Python 3.8.20 (default, Sep  7 2024, 18:35:08) 
[GCC 11.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from litellm._version import version
/home/mikolajz/.virtualenvs/litellm/lib/python3.8/site-packages/pydantic/_internal/_config.py:345: UserWarning: Valid config keys have changed in V2:
* 'fields' has been removed
  warnings.warn(message, UserWarning)
>>> version
'1.59.9'

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Name	Status	Preview	Comments	Updated (UTC)
litellm	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 13, 2025 9:17pm

[mikolajz]

@ishaan-jaff Sorry for the delay. Now it's done. How about the typing fix - should I create a separate PR for it?

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