anthropic[minor]: Implement actual anthropic tool call streaming #14432

Job	Run time
Check linting	5m 5s
test-exports / exports-esbuild	4m 13s
test-exports / exports-cf	4m 34s
test-exports / exports-cjs	4m 32s
test-exports / exports-esm	4m 35s
test-exports / exports-vercel	5m 33s
test-exports / exports-vite	4m 14s
test-exports / exports-tsc	4m 4s
	36m 50s

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