Improve `makeFindMixin` usability & efficiency when `local` option is used.
The makeFindMixin now allows using the mixed-in find${Resources} utility (e.g. findTodos for a todos service) when the local option is provided. It also updates the mixin so that the watchers are not created when using the local option, since the watchers only function is to re-run the API query when something changes. This change will avoid some useless processing that was occurring in local mode.