Add global config for Butlermock

[Devrax]

Describe the solution you'd like
A global config where to define where are each interface or types in the project, that way butlermock will only use the name of the interface or type to return a random generate object or primitive.

example, butlermock will look up for the butlermock.config.json and use the config that is there, logically, Butlermock will handle and internal configuration by default, and the butlermock.config.json will overwrite the default configurations.