Add plugin functional, initializers loader, additional methods to monads, refactor code, remove ReturnEngine class

[AnotherRegularDude]

Changes

• Added the ability to modify the base service class through a plugin system like in the Sequel
• Implement the functionality of applying different initializers to service classes.
  If a parent class has already applied one of the initializers,
  then an attempt to reapply initializer will cause an error for all of his children.
  Therefore, I left the basic service class Resol::Service without the initializer at all, this is breaking behavior.
  You need something like ApplicationSerivce < Resol::Service
• Remove all methods from Resol::Result, because Result specific methods logic is more optimal.
  Also, add #bind and #fmap methods.
• Remove ReturnEngine and add plugin instead.
• Add dependency container from `dry`` lib. Also use config lib from them.