@param moduleStore the copy of module store your action's module indicates
you can use this action's payload data, deal with it or fetch api or something else
when finished , you need return a Map that tell me which property was modified of the module store
// outside you have a module store like this:
// once you wanner rename 'reaction' to 'flutter-reaction'
// then in the class RenameAction's process method, code is like: