Use overlay ID for module import lookup (#4514)

* Add id to import pattern

* Finish testing importing in a block

crates/nu-command/tests/commands/use_.rs

@@ -0,0 +1,34 @@
+use nu_test_support::fs::{AbsolutePath, DisplayPath, Stub::FileWithContent};
+use nu_test_support::nu;
+use nu_test_support::pipeline;
+use nu_test_support::playground::Playground;
+
+#[test]
+fn use_module_file_within_block() {
+    Playground::setup("use_test_1", |dirs, nu| {
+        let file = AbsolutePath::new(dirs.test().join("spam.nu"));
+
+        nu.with_files(vec![FileWithContent(
+            &file.display_path(),
+            r#"
+                export def foo [] {
+                    echo "hello world"
+                }
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+                r#"
+                    def bar [] {
+                        use spam.nu foo;
+                        foo
+                    };
+                    bar
+                "#
+            )
+        );
+
+        assert_eq!(actual.out, "hello world");
+    })
+}