feat(ui): move socket event handling out of redux

Download events and invocation status events (including progress images) are very frequent. There's no real need for these to pass through redux. Handling them outside redux is a significant performance win - far fewer store subscription calls, far fewer trips through middleware.

All event handling is moved outside middleware. Cleanup of unused actions and listeners to follow.

invokeai/frontend/web/src/features/queue/hooks/useEnableInvocationCache.ts

@@ -1,4 +1,5 @@
-import { useAppSelector } from 'app/store/storeHooks';
+import { useStore } from '@nanostores/react';
+import { $isConnected } from 'app/hooks/useSocketIO';
 import { toast } from 'features/toast/toast';
 import { useCallback, useMemo } from 'react';
 import { useTranslation } from 'react-i18next';
@@ -7,7 +8,7 @@ import { useEnableInvocationCacheMutation, useGetInvocationCacheStatusQuery } fr
 export const useEnableInvocationCache = () => {
   const { t } = useTranslation();
   const { data: cacheStatus } = useGetInvocationCacheStatusQuery();
-  const isConnected = useAppSelector((s) => s.system.isConnected);
+  const isConnected = useStore($isConnected);
   const [trigger, { isLoading }] = useEnableInvocationCacheMutation({
     fixedCacheKey: 'enableInvocationCache',
   });