Initial implementation of random integer subcommand. (#2489)

* Initial implementation of random integer subcommand.

* Added additional examples.

Co-authored-by: Stacy Maydew <stacy.maydew@starlab.io>

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

@@ -0,0 +1,13 @@
+use nu_test_support::{nu, pipeline};
+
+#[test]
+fn generates_an_integer() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        random integer --min 42 --max 43
+        "#
+    ));
+
+    assert!(actual.out.contains("42") || actual.out.contains("43"));
+}