Flask Cache support

[avara1986]

Create a service like metrics or requests to support cache https://github.com/sh4nks/flask-caching

How-to:

• Read the tutorial How to create services
• Add new dependencies in setup.py
• Create the service
• Initialize the Service in create_app.Microservice.init_app

Challenge:
Try to pass the configuration from configuration file to cache initialization

pyms:
  services:
    cache:
      cache_type:
      .....