Add LangSmith tracing sample #1142

Job	Run time
build-lint-test (3.10, ubuntu-latest)	1m 32s
build-lint-test (3.10, windows-latest)	1m 41s
build-lint-test (3.10, macos-intel)	1m 57s
build-lint-test (3.14, ubuntu-latest)	1m 50s
build-lint-test (3.14, macos-arm)	1m 52s
build-lint-test (3.10, macos-arm)	1m 51s
build-lint-test (3.14, windows-latest)	1m 41s
build-lint-test (3.14, macos-intel)	1m 55s
	14m 19s

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