chore: factor out `StoreCore` #2444

Job	Run time
linux	3m 29s
code-quality / lints	1m 6s
licenses-audits / cargo-deny (advisories, licenses, bans, ...)	49s
link-checker / linkChecker	5s
msrv / msrv	1m 23s
wasm / wasm-build	1m 25s
	8m 17s

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