add "upload id" or similar to changes made with osw-python (at entity level or even higher)

[LukasGold]

Ideas:

• Create a metadata property on the entity level
  • Include a sub-object named "upload_id","change_id" or "commit_id" (type: list)
  • Create an entry on every change made by osw-python (prepend or append)
    • Default behavior: create a new uuid for every change made, but accept an externally passed uuid as well
    • Desired behavior: assign the same uuid for all changes made within one script execution run
• Use the wiki tagging function to identify changes made in one session -> include this in the osw-python on a top/upper level