echo $scope.aliases | pivot to see all of your aliases (#3203)

* enable ability to see all aliases, pull in code from scope branch

* add in the alias tests

* add back in my changes to variables.rs after merging in andrasios changes from PR #3217

crates/nu-engine/tests/evaluate/variables.rs

@@ -32,3 +32,39 @@ fn custom_config_path_variable_present() {
         );
     })
 }
+
+#[test]
+fn scope_variable_with_alias_present() {
+    Playground::setup("scope_variable_alias_test_1", |dirs, nu| {
+        let file = AbsolutePath::new(dirs.test().join("config.toml"));
+
+        nu.with_config(&file);
+        nu.with_files(vec![FileWithContent(
+            "config.toml",
+            "skip_welcome_message = true",
+        )]);
+
+        assert_that!(
+            nu.pipeline("alias t = time; echo $scope.aliases | get t"),
+            says().to_stdout("time")
+        );
+    })
+}
+
+#[test]
+fn scope_variable_with_correct_number_of_aliases_present() {
+    Playground::setup("scope_variable_alias_test_2", |dirs, nu| {
+        let file = AbsolutePath::new(dirs.test().join("config.toml"));
+
+        nu.with_config(&file);
+        nu.with_files(vec![FileWithContent(
+            "config.toml",
+            "skip_welcome_message = true",
+        )]);
+
+        assert_that!(
+            nu.pipeline("alias v = version; alias t = time; echo $scope.aliases | length -c"),
+            says().to_stdout("2")
+        );
+    })
+}