rename vusion_model + add model_manager super class and refactor manager classes + add dialogue manager
add dialogue manager skeleton
refactor more dialogue function from worker to manager
remove unecessary functions as refactored in the dialogue manager
refactor remove mongodb group function from dialogue manager
refactor code from worker to dialogue manager
fix model manager + store in memory the dialogues
fix dialogue_manager tests with loaded_dialogues
delete refactored tests
Merge branch 'feature/dialogue_manager' into develop