Enhanced Image: Support {AttributeShorthand} syntax

[LorisSigrist]

This PR adds support for the Attribute shorthand syntax on <enhanced:img components. It is now possible to write the following code:

<script>
  import src from "$lib/myImage.png?enhanced"
</script>

<enhanced:img {src} />

Previously this would error

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[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: e648afeb74dbdea81f0c8f8e85def68596dd4da0

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

This PR includes changesets to release 1 package

Name	Type
@sveltejs/enhanced-img	Patch

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[benmccann]

Thank you so much for this! Sorry it took me awhile to get to reviewing it. I'll merge it in just a minute when the CI turns green