FIX: Allow raw-view classes to be resolved from themes/plugins (PR #12685)

Since cd24eff5d98e74db4afe0257e4d9de1ad2556c5d, theme modules are now prefixed with the theme id. Therefore themes which defined raw-view classes will be broken

This commit updates the raw helper to use the resolver for looking up the view class. This automatically takes care of trying theme/plugin paths in addition to core paths.

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LGTM :heart: