add `item_menu` example #2107

Job	Run time
Typos	7s
Build Extractor	1m 51s
Dependency Graph (assets/depgraph.svg)	28s
Unused Dependencies	4m 12s
Clippy	2m 9s
Documentation	1m 30s
Formatting	16s
Miri Tests	2m 12s
Tests (windows-latest)	17m 49s
Tests (macos-latest)	7m 49s
Tests (ubuntu-latest)	9m 57s
	48m 20s

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