Feature: Implement nested map deserialization to configuration calls as a native exposed functionality

[superyuuki]

Currently, nested modular configuration (considering classes not present at compile-time for an application's primary configuration) is difficult to implement. Exposing a functionality to deserialize maps provided using DazzleConf's ValueSerializer and FlexibleType would allow for enhanced modularity as subclass configurations would be provided the ability to insert new features to a configuration's deserialization by simply providing an instance of their configuration's class object and letting the library handle the heavy lifting.