Allow the calculation of bytes and int. (#2160)

* Allow the calculation of bytes and int.

* fix clippy.

* minimal implement the into_into command.

* Revert "fix clippy."

This reverts commit 0d7cf72ed2.

* Revert "Allow the calculation of bytes and int."

This reverts commit 9c4e3787f5.

* set the argument to any type.

* if the argument is an int, return it with no change in value.

* add tests for into-int command.

* fix a faild test.

crates/nu-cli/tests/commands/into_int.rs

@@ -0,0 +1,25 @@
+use nu_test_support::{nu, pipeline};
+
+#[test]
+fn into_int_filesize() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        into-int 1kb | = $it / 1024
+        "#
+    ));
+
+    assert!(actual.out.contains("1"));
+}
+
+#[test]
+fn into_int_int() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        into-int 1024 | = $it / 1024
+        "#
+    ));
+
+    assert!(actual.out.contains("1"));
+}