* Refactor StorageJSON to keep loaded_integrations a set until its converted to a dict
after #5792 we will be checking loaded_integrations often. ESPHome
core keep uses a set, but it would get converted to a list when
passed through StorageJSON. Keep it a set until its needed to
be read/write to JSON so we do not have to linear searches on it
since they have a time complexity of O(n) vs O(1)
* legacy