core[minor],openai[patch]: Add usage metadata to `AIMessage`/`Chunk` #13264

Job	Run time
Check linting	2m 14s
test-exports / exports-esbuild	2m 11s
test-exports / exports-esm	2m 10s
test-exports / exports-cjs	2m 10s
test-exports / exports-cf	1m 57s
test-exports / exports-tsc	2m 10s
test-exports / exports-vite	2m 10s
test-exports / exports-vercel	2m 12s
	17m 14s

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