`network` widget variant to use package-widget for network base searching

[theiskaa]

Current version of widget requires already providen suggestions. And which makes working with network so hard. So, we've to implement a factory builder to create network-usage appropriate widget which don't requires the suggestions (maybe gonna request something different).

FieldSuggestion.network(
 boxBuilder: (context, index) {
   if(isLoading) return Center(child: LoadingWidget());

   return SingleChildScrollView(
     child: Column(
       children: [
          // ...
       ],
     ),
   );
 }
)