add `item_menu` example #2114

Job	Run time
Clippy	2m 3s
Formatting	20s
Build Extractor	1m 21s
Dependency Graph (assets/depgraph.svg)	27s
Typos	8s
Unused Dependencies	4m 18s
Documentation	1m 42s
Miri Tests	1m 40s
Tests (windows-latest)	16m 50s
Tests (macos-latest)	7m 13s
Tests (ubuntu-latest)	10m 21s
	46m 23s

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