Document custom image service props

[delucis]

Description (required)

Documents the ability to type additional image props added in withastro/astro#15014

For Astro version: 5.16.6. See astro PR #15014 (exact version subject to change if a patch is released before)

I’ll note that this feature is a little tricky to document. It follows the same pattern we use for the App.Locals type used by middleware (see “Middleware types” in the docs), but unlike middleware this is maybe more likely to be used by a library, so the types also need exposing somehow to the user. There are a few different ways to do this, but it feels out of scope to document in the section I added.

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[sarah11918]

This LGTM!