refactor(stackable-versioned): Introduce idents for fields/variants #4455

Job	Run time
Run Cargo Deny (bans licenses sources)	43s
Run Cargo Udeps	1m 43s
Run RustDoc	1m 23s
Run Cargo Deny (advisories)	47s
Run Cargo Tests	0s
All tests passed	0s
	4m 36s

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