Refactored edge cloud API, updated configs and requirements

.env.sample

Dockerfile

edge_cloud_management_api/__main__.py

edge_cloud_management_api/app.py

edge_cloud_management_api/configs/env_config.py

edge_cloud_management_api/controllers/app_controllers.py

...cloud_management_api/controllers/edge_cloud_controller.py

edge_cloud_management_api/models/application_models.py

edge_cloud_management_api/models/edge_cloud_models.py

edge_cloud_management_api/services/pi_edge_services.py

requirements.txt