feat(copilot): google gemini support

[ysfscream]

PR Checklist

If you have any questions, you can refer to the Contributing Guide

What is the current behavior?

Currently, MQTTX Copilot does not support using AI models from Google Generative AI (Gemini family). Users cannot select Google as a provider or utilize Gemini models for Copilot features.

Issue Number

None

What is the new behavior?

This PR introduces support for Google Generative AI models within MQTTX Copilot. Users can now select 'Google' as a provider in the Copilot settings and choose from various Gemini models (e.g., gemini-1.5-pro-latest, gemini-2.0-flash, etc.).

Key changes include:

• Added the @ai-sdk/google dependency.
• Updated type definitions (src/types/copilot.ts) to include the Google provider configuration (GoogleOptionsModel).
• Updated AImodelsOptions in src/utils/ai/copilot.ts to list the Google provider, its models, the default API endpoint (https://generativelanguage.googleapis.com/v1beta), and the createGoogleGenerativeAI function.
• Modified getModelProvider in src/utils/ai/copilot.ts to correctly instantiate the Google provider using the AI SDK.
• Updated AIAgent in src/utils/ai/AIAgent.ts to correctly determine the providerType ('Google') based on the selected model or host URL, ensuring the correct provider is instantiated.
• Updated unit tests (tests/unit/utils/ai/copilot.spec.ts) to include checks for the Google provider and ensure the required providerType and baseURL parameters are passed correctly.

Does this PR introduce a breaking change?

• Yes
• No

Specific Instructions

Users wishing to use Google Gemini models will need to:

1. Select 'Google' as the provider in the Copilot settings.
2. Select a desired Gemini model.
3. Provide their Google Generative AI API Key in the appropriate settings field.
4. Ensure the correct API Host URL is configured (defaults to https://generativelanguage.googleapis.com/v1beta).

Other information

Optional: Add any other relevant context or notes here.

[Copilot]

Copilot reviewed 5 out of 6 changed files in this pull request and generated 2 comments.

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