Add API for scenario distribution Zipfan, Uniform

[AntyaDev]

• ZipFan
• Uniform
• Multinomial

API:

var scenario = Scenario.Create("scenario", async context =>
{
    var r1 = context.Random.Next(minValue: 10, maxValue: 100);
    var r2 = Zipf.Sample(s: 0.9, n: 100, rnd: random);
    
    var ratios = new[] {0.1, 0.2, 0.7}; // 10%, 20%, 70%
    int[] r3 = Multinomial.Sample(random, ratios, 1);  // r3 = [0, 0, 1] 

    return Response.Ok();
}

Dynamic-workloads