Add new APIs for cwl_utils & test coverage.

[mosalehio]

• Modified Upload API to make it more comprehensive.
• Created new API for download functionality
• Added new test file: tests/cwl_utils/test_cwl_api
• Included unit and integration tests for Upload and Download API code in cwl_api
• Achieved 90% test coverage of cwl_api file.

Examples of using APIs in terminal:

curl -X GET "http://localhost:8000/analytics_automated/downloadcwl/?job_name=psipredddd" -H "Accept: application/json"

curl -X POST \ -H "Content-Type: multipart/form-data" \ -H "Accept: application/json" \ -F "files=@analytics_automated/tests/example_cwl_files/create_fasta2.cwl" \ -F "files=@analytics_automated/tests/example_cwl_files/task2.cwl" \ http://localhost:8000/analytics_automated/uploadcwl/

[mosalehio]

cwl_api should probably be moved to analytics_automated/