Summarize beds under facility

[iamsdas]

Added summarization for the beds under facility in the FacilityRelatedSummary table, which will be visible via the /api/v1/facility_bed_summary/ API.

Summary will be of the form:

{
  "count": 1,
  "next": null,
  "previous": null,
  "results": [
    {
      "facility": {...},
      "created_date": "...",
      "modified_date": "...",
      "data": {
        "beds_count": 2,
        "utilization_percent": 0,
        "facility_name": "...",
        "occupied_beds_count": 0
      }
    }
  ]
}

Fixes: #709

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