Remove config.storage dependency from ConfigEntityStorage

Problem/Motivation

ConfigEntityStorage depends on both the config factory and the config storage this makes it unnecessarily complicated to use it to load configuration from a different storage.

Proposed resolution

Remove config storage dependency since the only reason it has that is to listAll(). ConfigFactory::listAll() exists already and delegates listing to it's storage. That means all we need to do is swap the storage on the config factory and use that factory with ConfigEntityStorage in order to load configuration from a different storage.

Remaining tasks

Review patch.

User interface changes

None.

API changes

ConfigEntityStorage and classes that extend it no longer have a direct dependency on config storage.