Loading analyzer engine & recognizer registry from configuration file

[roeybc]

Change Description

This PR adds a file-based configuration for presidio-analyzer. It allows users to:

1. Configure their app (either Python or REST) using a set of three yaml files for each main engine:
   • Analyzer
   • Recognizer Registry
   • NLP Engine
2. Pass those files into the Docker image and read them when the REST version of Presidio (in flask) is loaded
3. Easily define which recognizer to use, which language they should support + specific configuration for each (for example, a list of context words per language)

[omri374]

/azp run

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