Add 'str from' subcommand (#2125)

* add human, precision commands

* add 'str from' subcommand (converted from human/precision commands)

move human tests to str from

* add default locale, platform-specific SystemLocale use

* fix platform specific num-format dependency, remove invalid test

* change 'str from' localization to static num_format::Locale::en

* minor cleanup, nudge ci

* re-attempt ci

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

@@ -340,3 +340,54 @@ fn substrings_the_input_and_treats_end_index_as_length_if_blank_end_index_given(
         assert_eq!(actual.out, "arepas");
     })
 }
+
+#[test]
+fn from_decimal_correct_trailing_zeros() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        = 1.23000 | str from -d 3
+        "#
+    ));
+
+    assert!(actual.out.contains("1.230"));
+}
+
+#[test]
+fn from_int_decimal_correct_trailing_zeros() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        = 1.00000 | str from -d 3
+        "#
+    ));
+
+    assert!(actual.out.contains("1.000"));
+}
+
+#[test]
+fn from_int_decimal_trim_trailing_zeros() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        = 1.00000 | str from | format "{$it} flat"
+        "#
+    ));
+
+    assert!(actual.out.contains("1 flat")); // "1" would match "1.0"
+}
+
+#[test]
+fn from_table() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        echo '[{"name": "foo", "weight": 32.377}, {"name": "bar", "weight": 15.2}]'
+        | from json
+        | str from weight -d 2
+        "#
+    ));
+
+    assert!(actual.out.contains("32.38"));
+    assert!(actual.out.contains("15.20"));
+}