[QE] Feature : Create a script to handle metadata files for new testcases

Every time we work in a new kafka version, we need to manually identify which cases were added since previous.
This scripts compare the test report from a previous and a current test run in Jenkins and then :

• Identifies which tests were added
• Check if the metadata file for that already exists.
• If not, create it based in a header template
• If yes, copy it and then append metadata definition to it