nu-parser + nu-protocol: switch to metric for KB, MB, GB, add KiB, MiB, GiB units (#3035)

fixes inconsistency with formatting/rendering which uses standard Rust byte_unit
https://en.wikipedia.org/wiki/Byte#Multiple-byte_units

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

@@ -5,7 +5,19 @@ fn into_int_filesize() {
     let actual = nu!(
         cwd: ".", pipeline(
         r#"
-        into-int 1kb | each {= $it / 1024 }
+        into-int 1kb | each {= $it / 1000 }
+        "#
+    ));
+
+    assert!(actual.out.contains('1'));
+}
+
+#[test]
+fn into_int_filesize2() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        into-int 1kib | each {= $it / 1024 }
         "#
     ));