Add support to fetch test case attachments
Now the --attachments option of the test command will fetch all test run and test case attachments files. These files will be saved in a directory hierarchy of the form <attachments-dir>/<test-run-dir>/<test-case-dir>, and each of the files will be saved in the specific category for each of the test runs and test cases. Also the output message is much simpler now, and it will only print a logger info message after all the files have been saved to the location.
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