Add dice subcommand to random command (#2082)

* Add dice subcommand to random command

* Update random dice test name

* Stream results of random dice

* Thanks Clippy!

crates/nu-cli/tests/commands/random/dice.rs

@@ -0,0 +1,13 @@
+use nu_test_support::{nu, pipeline};
+
+#[test]
+fn rolls_4_roll() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        random dice -d 4 -s 10 | count
+        "#
+    ));
+
+    assert_eq!(actual.out, "4");
+}

crates/nu-cli/tests/commands/random/mod.rs

@@ -1,2 +1,3 @@
 mod bool;
+mod dice;
 mod uuid;