iAPI: Make storePart argument optional in overloads

[luisherranz]

What?

When I made the improvements to the types in pull request #64577, I forgot to consider the possibility of typing the store, but not passing a store part.

Required when some WooCommerce blocks need to get the state of the woocommerce store, like this one.

Why?

Because sometimes you want to use store to get the state and actions of an external store. And in that case, you don't want to pass any store part.

const otherStore = store<OtherStoreTypes>( 'other-store' );

How?

Simply making storePart optional when passing the full types.

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Co-authored-by: luisherranz <[email protected]>
Co-authored-by: SantosGuillamot <[email protected]>
Co-authored-by: DAreRodz <[email protected]>

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[SantosGuillamot]

Looks good to me 🙂

[DAreRodz]

LGTM!