Add utility function to ItemStack for creating custom PlayerHeads #2004

Job	Run time
Typos	7s
Dependency Graph (assets/depgraph.svg)	26s
Build Extractor	1m 52s
Unused Dependencies	3m 18s
Clippy	1m 40s
Documentation	1m 0s
Formatting	15s
Miri Tests	3m 15s
Tests (windows-latest)	8m 20s
Tests (macos-latest)	8m 18s
Tests (ubuntu-latest)	8m 36s
	37m 7s

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