fix: explicitly type electricCollectionOptions return value

[pawelblaszczyk5]

Fixes #392

Currently, if someone used exactOptionalPropertyTypes in their tsconfig return type from electricCollectionOptions wasn't assignable to createCollection. This could be observed in the example in the repository, when added the flag to the tsconfig:

After the fix in the PR:

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🦋 Changeset detected

Latest commit: f1a8e30

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@tanstack/electric-db-collection	Patch

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