Store API config as Python classes instead of Python file

[alvarobartt]

As proposed by @gabrielmbmb, the Flask Restx configuration should be stored as Python class instances (such as the example provided below) instead of directly into a Python file so as to improve both clarity and efficiency, since it is the common standard.

class BaseConfig(object):
    DEBUG = False
    TESTING = False

class DevelopConfig(BaseConfig):
    ENV = "development"
    DEBUG = True
    PROPAGATE_EXCEPTIONS = False
​
class ProductionConfig(BaseConfig):
    ENV = "production"
​
class TestingConfig(BaseConfig):
    ENV = "testing"
    TESTING = True
    DEBUG = True

File to modify/update can be found at: config.py