Add support for vercel `ToolLoopAgent`

[nicohrubec]

docs: https://ai-sdk.dev/docs/agents/overview#toolloopagent-class

Internally this calls generateText so the core span processing logic should hopefully transfer to this, but the patching logic will need some special handling.

[linear-code]

JS-2029

[github-actions]

A PR closing this issue has just been released 🚀

This issue was referenced by PR #20087, which was included in the 10.48.0 release.