Add sample for Nexus cancellation #1086

Job	Run time
build-lint-test (3.14, macos-intel)	19m 28s
build-lint-test (3.10, ubuntu-latest)	5m 46s
build-lint-test (3.14, windows-latest)	18m 34s
build-lint-test (3.10, macos-arm)	9m 6s
build-lint-test (3.10, windows-latest)	6m 39s
build-lint-test (3.10, macos-intel)	9m 32s
build-lint-test (3.14, macos-arm)	10m 1s
build-lint-test (3.14, ubuntu-latest)	15m 55s
	1h 35m 1s

Provide feedback