Add bool subcommand to random (#2061)

* Add bool subcommand to random

* Fix function name copy paste error

* Fix issue 2062: allow deserialization of a decimal

* Add bias flag to `random bool`

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

@@ -0,0 +1,16 @@
+use nu_test_support::{nu, pipeline};
+
+#[test]
+fn generates_a_bool() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        random bool
+        "#
+    ));
+
+    let output = actual.out;
+    let is_boolean_output = output == "true" || output == "false";
+
+    assert!(is_boolean_output);
+}