Rework uSES init to not rely on module initialization order

[markerikson]

This PR:

• Rewrites the per-entry-point initialization of useSyncExternalStore to work regardless of how modules are loaded and initialized

The previous attempt worked fine in local dev + tests, but failed when built and run in a real app.

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[github-actions]

Size Change: +123 B (0%)

Total Size: 21.3 kB

Filename	Size	Change
dist/react-redux.js	16.2 kB	+134 B (0%)
dist/react-redux.min.js	5.07 kB	-11 B (0%)

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