Added js version of Error_handling notebook

[Rahul-Lashkari]

• Added JS equivalent for quickstarts/Error_handling.ipynb notebook
• updated quickstarts-js/README.md

[gemini-code-assist[bot]]

Summary of Changes

Hello @Rahul-Lashkari, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new JavaScript notebook dedicated to robust error handling when interacting with the Gemini API. It provides practical examples and guidance on managing common API issues such as transient errors, rate limits, and timeouts, ultimately enhancing the reliability and resilience of applications built using the Gemini API. The accompanying README has also been updated to reflect this new addition.

Highlights

• New JavaScript Notebook: A new notebook, quickstarts-js/Error_handling.js, has been added to demonstrate various error handling strategies for the Gemini API.
• Error Handling Strategies: The new notebook covers automatic retries for transient errors, manual adjustment of API call timeouts, and implementing custom backoff and retry logic with exponential backoff.
• README Update: The quickstarts-js/README.md file has been updated to include a new entry for the 'Error Handling' notebook, making it discoverable for users.

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[andycandy]

Hi @Rahul-Lashkari, thank you for your contribution! However, the JavaScript file you submitted contains several documentation issues for example, it references Python packages and sources instead of JavaScript ones. Additionally, the error handling section doesn’t fully align with the original notebook. Please make these adjustments in your PR.