Add token usage to `LanguageModelTextStream` (#27490)

Release Notes:

- N/A

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Co-authored-by: Michael Sloan <michael@zed.dev>
1e8b50f471Thomas Mickley-Doyle committed on 3/26/2025, 10:21:01 PM· committed by GitHubparent5f8c53f
3 files changedLine totals unavailable