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Add LangFuse tracing samples #1328

Job	Run time
build-lint-test (3.10, ubuntu-latest)	6m 48s
build-lint-test (3.14, ubuntu-latest)	7m 22s
build-lint-test (3.14, macos-arm)	7m 40s
build-lint-test (3.14, macos-intel)	8m 28s
build-lint-test (3.14, windows-latest)	8m 12s
build-lint-test (3.10, macos-arm)	10m 3s
build-lint-test (3.10, windows-latest)	7m 29s
build-lint-test (3.10, macos-intel)	12m 51s
	1h 8m 53s