text: Title: Pass dict to provider 
  Body: Hi, I have a dict in my Configuration that I want to pass to a provider but I can't figure out how to do it.
  
  ```
  container = Container()
  container.wire(packages=[__name__])
  
  container.configuration.from_dict({
      "provider1": {
          "config": {
              "key1": "value1",
              "key2": "value2"
          }
      }
  })
  ```
  
  ```
  class Container(containers.DeclarativeContainer):
  
      configuration = providers.Configuration()
  
      provider1 = providers.Singleton(
          Provider1,
          config=configuration.provider1.config # I want to pass this as a dict
      )
  
  ```