Fix Python 3.9 compatibility issues in from_provider function

[devin-ai-integration]

Fix Python 3.9 compatibility issues in from_provider function

This PR addresses the CI failures in the implementation of issue #1542 by:

1. Reverting the type annotation syntax from X | Y to Union[X, Y] for Python 3.9 compatibility
2. Updating the GenerativeModel initialization to use genai.configure(api_key=...) when an API key is provided

Changes

• Reverted type annotations to use Union[X, Y] instead of X | Y syntax
• Updated the GenerativeModel initialization in the generative-ai provider section
• Ensured all overloaded function signatures have the same parameters

Fixes #1542

Link to Devin run: https://app.devin.ai/sessions/2b32f7dbd32042a09271c1348e76c086
Requested by: Jason Liu (work@jxnl.co)

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
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[devin-ai-integration]

Closing due to inactivity for more than 7 days.