feat(anthropic): document and test fine grained tool streaming

[mdrxy]

https://platform.claude.com/docs/en/agents-and-tools/tool-use/fine-grained-tool-streaming

[codspeed-hq]

CodSpeed Performance Report

Merging #34118 will not alter performance

_{Comparing mdrxy/thropic-tool (93c9af6) with mdrxy/effort-anthropic (a6a08ad)¹}

Summary

✅ 3 untouched
⏩ 31 skipped²

Footnotes

1. No successful run was found on mdrxy/effort-anthropic (43a2253) during the generation of this report, so f85adc3 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

2. 31 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩