Add sample for Nexus cancellation #1087

Job	Run time
build-lint-test (3.10, ubuntu-latest)	5m 48s
build-lint-test (3.14, macos-arm)	11m 16s
build-lint-test (3.10, macos-intel)	11m 27s
build-lint-test (3.10, windows-latest)	6m 25s
build-lint-test (3.14, windows-latest)	20m 10s
build-lint-test (3.14, macos-intel)	15m 19s
build-lint-test (3.14, ubuntu-latest)	16m 2s
build-lint-test (3.10, macos-arm)	7m 15s
	1h 33m 42s

Provide feedback