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-plugin-test-support/src/plugin_test.rs

@@ -344,9 +344,6 @@ impl PluginTest {
                 // All equal, and same length
                 Ok(true)
             }
-            // Must collect lazy records to compare.
-            (Value::LazyRecord { val: a_val, .. }, _) => self.value_eq(&a_val.collect()?, b),
-            (_, Value::LazyRecord { val: b_val, .. }) => self.value_eq(a, &b_val.collect()?),
             // Fall back to regular eq.
             _ => Ok(a == b),
         }