feat: initialize scrollSnapsStore on init

[shyakadavis]

Follow-up for #1052

I'm really sorry for forgetting this; glad I was reminded of it when doing some Embal-related research here: davidjerleke/embla-carousel#847 (reply in thread)

Speaking of, wanted to send a P.R for initializing the view slides as well, but that sounds too specific (like my use case), thus forewent that.

Thanks.

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[huntabyte]

Is this already taken care of in the default style as well?

Edit: I just checked, and I'm not seeing it. Let's make sure it's added there as well so the two styles have feature parity.

Thank you!

[shyakadavis]

Oops. My bad, Hunter.

[shyakadavis]

Done, @huntabyte

Thanks. 🙂

[huntabyte]

Thank you!