Fix previous messages pagination query. Update flutter_bloc and cached_network_image

[spitfire55]

Main fix is fixing the pagination of messages so that the ordering of messages is called prior to the startAtDocument function. Also had to update the dependencies because cached_network_image dependency was breaking on 1.17.2. Updating it to 2.2.0 also forced me to update flutter_bloc to 4.0.0, which led to the refactor of all the dispatch calls to add calls.

[lakshit1]

This pr is also creating these following problems :

registerResGeneratingTask is deprecated, use registerGeneratedResFolders(FileCollection) registerResGeneratingTask is deprecated, use registerGeneratedResFolders(FileCollection) registerResGeneratingTask is deprecated, use registerGeneratedResFolders(FileCollection) /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flushbar-1.9.0/lib/flushbar_route.dart:266:8: Error: The method 'FlushbarRoute.install' has more required arguments than those of overridden method 'OverlayRoute.install'. void install(OverlayEntry insertionPoint) { ^ /C:/src/flutter/packages/flutter/lib/src/widgets/routes.dart:46:8: Context: This is the overridden method ('install'). void install() { ^ /C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flushbar-1.9.0/lib/flushbar_route.dart:274:18: Error: Too many positional arguments: 0 allowed, but 1 found. Try removing the extra positional arguments. super.install(insertionPoint); ^