Add Gemini API Support

**Description:**

We need to integrate the Gemini API into our application. Google Gemini API offers free usage with rate limits, making it an attractive option for enhancing our service's capabilities. The API should be used to expand our existing functionality, while ensuring that we respect the rate limits imposed by the API to avoid any disruptions or excessive throttling.

**Additional Info:**
- Refer to the Gemini API pricing and limits: [Google Gemini API Pricing](https://ai.google.dev/pricing).