Find and load all modules implementing the given Behaviour.

Several methods to detect implementations can be applied:

• :beam_file_introspection: filters all modules in .beam files of the Mix project implementing behaviour
• :code_all_loaded: filters all modules returned by :code.all_loaded/0 the implementing behaviour

Unless otherwise specified with the optional impl_detection_methods argument, both methods are applied when the BEAM is running in interactive mode (which is the default). In embedded mode (which is used in releases), only the :code_all_loaded method and should be sufficient since the boot script loads all modules upfront.