Tornado and Earthquake classes need to have hazardDatasets field

[longshuicy]

There are two tasks for this issue:

• Add hazardDatasets to Tornado
• For model Earthquake, change rasterDatasets to hazardDatasets

It's good practice to follow other hazards example to have hazardDatasets field. Tornado only has one shapefile, but still it's good to reshape it.

e.g. here is what tornado looks like

{
    "tornadoType": "dataset",
    "id": "5f36ba4b37b8187d11c68375",
    "name": "pytest - Joplin Tornado",
    "description": "Joplin tornado hazard",
    "creator": "vnarah2",
    "threshold": null,
    "thresholdUnit": "mph",
    "spaces": [
        "vnarah2"
    ],
    "date": "2020-08-14T16:22:32+0000",
    "datasetId": "5f36ba4837e20751c116a815"
}

Flood looks like this instead

{
    "floodType": "dataset",
    "id": "5f4d02e99f43ee0dde768406",
    "name": "Lumberton Deterministic Flood - riverine flooding",
    "description": "Lumberton dataset based deterministic hazard - 3 datasets",
    "date": "2020-08-31T14:02:11+0000",
    "creator": "cwang138",
    "spaces": [
        "orphans",
        "incore"
    ],
    "hazardDatasets": [
        {
            "hazardType": "deterministic",
            "datasetId": "5f4d02e352147a614c71960b",
            "demandType": "inundationDepth",
            "demandUnits": "ft",
            "threshold": null,
            "floodParameters": {
                "model": "riverine flooding"
            }
        },
        {
            "hazardType": "deterministic",
            "datasetId": "5f4d02e737e20751c11c0035",
            "demandType": "waterSurfaceElevation",
            "demandUnits": "ft",
            "threshold": null,
            "floodParameters": {
                "model": "riverine flooding"
            }
        }
    ]
}

Model based eq: java/edu/illinois/ncsa/incore/service/hazard/models/eq/EarthquakeModel.java