Remove lazy records (#12682)

# Description
Removes lazy records from the language, following from the reasons
outlined in #12622. Namely, this should make semantics more clear and
will eliminate concerns regarding maintainability.

# User-Facing Changes
- Breaking change: `lazy make` is removed.
- Breaking change: `describe --collect-lazyrecords` flag is removed.
- `sys` and `debug info` now return regular records.

# After Submitting
- Update nushell book if necessary.
- Explore new `sys` and `debug info` APIs to prevent them from taking
too long (e.g., subcommands or taking an optional column/cell-path
argument).

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

@@ -98,21 +98,6 @@ fn insert_uses_enumerate_index() {
     assert_eq!(actual.out, "[[index, a, b]; [0, 7, 8], [1, 6, 8]]");
 }
 
-#[test]
-fn insert_support_lazy_record() {
-    let actual =
-        nu!(r#"let x = (lazy make -c ["h"] -g {|a| $a | str upcase}); $x | insert a 10 | get a"#);
-    assert_eq!(actual.out, "10");
-}
-
-#[test]
-fn lazy_record_test_values() {
-    let actual = nu!(
-        r#"lazy make --columns ["haskell", "futures", "nushell"] --get-value { |lazything| $lazything + "!" } | values | length"#
-    );
-    assert_eq!(actual.out, "3");
-}
-
 #[test]
 fn deep_cell_path_creates_all_nested_records() {
     let actual = nu!("{a: {}} | insert a.b.c 0 | get a.b.c");