Allow returning undefined from encode to remote param from URL

[Dragon-Hatcher]

Sometimes we don't want the parameter to show up in the URL. See #36

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🦋 Changeset detected

Latest commit: 943956cfcd97e84d63d2b9d60a788646a8b333ea

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

This PR includes changesets to release 1 package

| Name | Type | | ----------------------- | ----- | | sveltekit-search-params | Patch |

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[paoloricciuti]

Thanks for contributing, sorry for taking too long to review this