Update the framework to work as a pip package

[TB-1993]

Goal: To make the python framework pip installable

This will require the addition of a setup.py file and init.py files. It may also require a restructuring of the directories.

Acceptance Criteria

• pip install git+git@github.com:rdkcentral/python_raft.git@master works to install the framework
• Users can write tests only using import python_raft or from python_raft import ... without the need to clone this repo or create their tests with a fixed directory structure.