Add support for static columns with StaticColumnAttribute

New attribute that can be placed on a column:

    [Table]
    public class TableWithStaticColumn
    {
        [PartitionKey]
        public int PartitionKey1 { get; set; }

        [StaticColumn]
        public string StaticField { get; set; }

        [ClusteringKey(1)]
        public int ClusteringKey1 { get; set; }

        public decimal Value { get; set; }
    }

Used when generating create script.