move plot_pareto from aquatic_udp_bench crate into own crate

aquatic_udp_bench/src/common.rs

@@ -0,0 +1,27 @@
+use indicatif::{ProgressBar, ProgressStyle};
+use rand::Rng;
+use rand_distr::Pareto;
+
+
+pub const PARETO_SHAPE: f64 = 0.1;
+pub const NUM_INFO_HASHES: usize = 10_000;
+
+
+pub fn create_progress_bar(name: &str, iterations: u64) -> ProgressBar {
+    let t = format!("{:<8} {}", name, "{wide_bar} {pos:>2}/{len:>2}");
+    let style = ProgressStyle::default_bar().template(&t);
+
+    ProgressBar::new(iterations).with_style(style)
+}
+
+
+pub fn pareto_usize(
+    rng: &mut impl Rng,
+    pareto: Pareto<f64>,
+    max: usize,
+) -> usize {
+    let p: f64 = rng.sample(pareto);
+    let p = (p.min(101.0f64) - 1.0) / 100.0;
+
+    (p * max as f64) as usize
+}