Vercel AI spanProcessor inital version

[e-hosseini]

Normalize the AI SDK OpenTelemetry data to gen_ai semantic by introducing the Vercel AI span processor. This change to the span's data will enable Logfire to generate the Generation panel.

[hyperlint-ai]

PR Change Summary

Introduced the Vercel AI span processor to normalize AI SDK OpenTelemetry data, enhancing observability and analytics for AI actions in Logfire.

• Added integration instructions for the Logfire Vercel AI span processor in the README.
• Created a new example demonstrating OpenTelemetry traces with Vercel AI and Logfire.
• Updated documentation to highlight the benefits of using the Logfire span processor for AI workflows.

Modified Files

• README.md

Added Files

• examples/vercel-ai/README.md
• packages/logfire-vercel-ai-span-processor/README.md

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