Defines an API CRUD for DataTypes.

GET /api/performance-types/
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

[
    {
        "id": 1,
        "name": "Rice Methane",
        "description": "Rice Methane Performance Data",
        "actual_value_header": "Measured CH4 Flux",
        "estimated_value_header": "Modeled CH4 Flux",
        "gramp_model": 2
    }
]