Add Grok support

[devin-ai-integration]

Add Grok Support

This PR adds support for Grok to the aisdk-go repository, following the same pattern as the existing integrations for OpenAI, Anthropic, and Google.

Changes

• Added the HamGuy/go_grok dependency to go.mod
• Created a new grok.go file with the following functions:
  • ToolsToGrok: Converts tools to Grok's format
  • MessagesToGrok: Converts messages to Grok's format
  • GrokToDataStream: Pipes a Grok stream to a DataStream
• Created tests for the Grok integration in grok_test.go
• Updated README.md to include information about Grok support

Testing

The implementation includes unit tests that verify the functionality of the Grok integration. The tests include:

• Converting tools to Grok's format
• Converting messages to Grok's format
• Converting a Grok stream to a DataStream
• A live test that requires the GROK_API_KEY environment variable to be set

Notes

The implementation follows the same pattern as the existing integrations for OpenAI, Anthropic, and Google. It uses the HamGuy/go_grok SDK to interact with the Grok API.

Link to Devin run: https://app.devin.ai/sessions/4a1381003eaa4fd3a2f6a261fe231032
Requested by: Kyle

[devin-ai-integration]

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