refactor(stackable-versioned): Introduce idents for fields/variants #4454

Job	Run time
Run Cargo Deny (bans licenses sources)	49s
Run RustDoc	1m 23s
Run Cargo Deny (advisories)	47s
Run Cargo Udeps	1m 42s
Run Cargo Tests	0s
All tests passed	0s
	4m 41s

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