Add source type zip to internal Pages API lookup paths

Update /api/v4/internal/pages -> return a "source"."type":“zip” with a path. e.g.

{
	"lookup_paths" : [
	{
		"source": {
			"type": "zip",
			"path": "https://presigned.url/public.zip",
			"_":"or from file path"
			"path": "file:///shared/pages/domain/project/public.zip"
                 }
	}
        ]
}