chore: factor out `StoreCore` #2448

Job	Run time
linux	3m 58s
code-quality / lints	4m 15s
msrv / msrv	1m 32s
licenses-audits / cargo-deny (advisories, licenses, bans, ...)	52s
link-checker / linkChecker	6s
wasm / wasm-build	1m 51s
	12m 34s

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