Implement workflow essence extractor
- Extract useful information from airflow workflow code
- Produce "essence" as a json output
- Output will be passed to workflow controller for workflow management

No source code change.

Change-Id: I01de9939fdf699522e81c369676c33c73a38b4bc
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+.noseids
+.vscode
+build
+dist
+.coverage
+coverage.xml
+cover
+.tox
+.DS_Store
+nose2-results.xml
+venv-service
+*.pyc
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