Add "source_system" and "ext_operation_type" to operation

[petrdvorak]

Currently, we do not know which system created the operation, and what type of operation was initiated in that system.

Maybe this could be solved by applicationContext:

{
    "applicationContext": {
      "id": "democlient",
      "name": "Demo application",
      "description": "Web Flow demo application",
      "originalScopes": ["pisp"],
      "extras": {
        "applicationOwner": "Wultra"
      }
    }
}