xAPI video events do not emit required progress extension

[e0d]

The progress extension is required in certain cases.

The LRP MUST assign progress value to statements with "paused", "terminated" and "completed" verbs.

This should be represented as follows:

"result": {
        "extensions": {
            "https://w3id.org/xapi/video/extensions/played-segments": "0[.]2.997",
            "https://w3id.org/xapi/video/extensions/progress": 0.06,
            "https://w3id.org/xapi/video/extensions/time": 2.997
        }
    }

Relevant code.