Provide array parameter helper

[devhawk]

Information about contract structures is not stored in the contract manifest. As such, the contract interface generator cannot generate typesafe C# declaration for a contract operation such as this:

public struct Royalty
{
    public readonly UInt160 address;
    public readonly BigInteger value;
}

void SetRoyaltiesForContract(UInt160 contract, Royalty[] royalties);

Test framework should have a mechanism to make it easy/feasible for a test author to construct an array of Royalty instances