Create endpoint to retrieve logbook usage statistics

We need a endpoint that gives some hints about how the logbook is being used.

Endpoint proposed is:

/logbook/{sessionId}/stats

And it returns an array of:

    {
        "_id": {
            "investigationId": 365019478
        },
        "count": 20,
        "investigationId": 365019478,
        "title": "Commissioning of scanning diffraction setup",
        "parameters": {
            "__fileCount": "77",
            "__volume": "16237319033",
            "__datasetCount": "5",
            "__sampleCount": "3",
            "__elapsedTime": "0",
            "Id": "92050",
            "IsCancelled": "false"
        },
        "startDate": "2021-02-07T08:00:00.000+01:00",
        "endDate": "2021-02-15T08:00:00.000+01:00",
        "annotations": 10,
        "notifications": 405
    },

It can be found both investigation statisticas as dataset and datafile count + the number of annotations and notifications.