Support Nested schema objects in additional metadata rendering and add unit tests for CWL metadata parser

[anushacs-dell]

• Update extends the rendering logic to dynamically detect nested objects
• Implemented dynamic object detection using typeof v === 'object'
• Implement the unit test for cwl metadata
• Read all tests/fixtures/cwl files automatically.
• Parses yaml cwl files
• ensure parser does not crash, works for future cwl files.
• The flow is cwl file - yaml.load() - parseMetadata - test passes if parser works.