Update Vercel AI span names and attributes of generate, stream, embed and tool call calls

[AbhiPrasad]

Description

https://www.notion.so/sentry/WIP-Span-layout-of-AI-agents-1fa8b10e4b5d80f0a83dd251a5ea4ab1

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A PR closing this issue has just been released 🚀

This issue was referenced by PR #16497, which was included in the 9.28.0 release.