Get all users

{
    "id": 0,
    "username": "string",
    "email": "string",
    "roleEntities": [
        {
            "id": 0,
            "name": "string"
        }
    ],
    "communityGardens": [
        {
            "id": 0,
            "name": "string"
        }
    ],
    "volunteerActivity": {
        "id": 0,
        "activityName": "string"
    }
}