Add support for inline_asset_content in app extensions

Hello,

Recently, many features added to the core Liquid did not work in theme app extensions (this was the case for visible_if, although support has been added recently). Having the same language works differently across environments provides a bad user experience, as as I dev I assume that the Liquid doc would apply to theme app extensions as well.

One thing specifically that is still not supported in app extensions are the inline_asset_content (Liquid filters) filter.

This filter would helps a lot to keep an app within the 100 kB Liquid limit. Would it be possible to add support for it?

Thanks.