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/src/system/sys.rs

@@ -1,6 +1,5 @@
 use chrono::{DateTime, Local};
 use nu_engine::command_prelude::*;
-use nu_protocol::LazyRecord;
 use std::time::{Duration, UNIX_EPOCH};
 use sysinfo::{
     Components, CpuRefreshKind, Disks, Networks, System, Users, MINIMUM_CPU_UPDATE_INTERVAL,
@@ -32,10 +31,7 @@ impl Command for Sys {
         call: &Call,
         _input: PipelineData,
     ) -> Result<PipelineData, ShellError> {
-        let span = call.span();
-        let ret = Value::lazy_record(Box::new(SysResult { span }), span);
-
-        Ok(ret.into_pipeline_data())
+        Ok(all_columns(call.head).into_pipeline_data())
     }
 
     fn examples(&self) -> Vec<Example> {
@@ -64,36 +60,18 @@ pub struct SysResult {
     pub span: Span,
 }
 
-impl LazyRecord<'_> for SysResult {
-    fn column_names(&self) -> Vec<&'static str> {
-        vec!["host", "cpu", "disks", "mem", "temp", "net"]
-    }
-
-    fn get_column_value(&self, column: &str) -> Result<Value, ShellError> {
-        let span = self.span;
-
-        match column {
-            "host" => Ok(host(span)),
-            "cpu" => Ok(cpu(span)),
-            "disks" => Ok(disks(span)),
-            "mem" => Ok(mem(span)),
-            "temp" => Ok(temp(span)),
-            "net" => Ok(net(span)),
-            _ => Err(ShellError::LazyRecordAccessFailed {
-                message: format!("Could not find column '{column}'"),
-                column_name: column.to_string(),
-                span,
-            }),
-        }
-    }
-
-    fn span(&self) -> Span {
-        self.span
-    }
-
-    fn clone_value(&self, span: Span) -> Value {
-        Value::lazy_record(Box::new((*self).clone()), span)
-    }
+fn all_columns(span: Span) -> Value {
+    Value::record(
+        record! {
+            "host" => host(span),
+            "cpu" => cpu(span),
+            "disks" => disks(span),
+            "mem" => mem(span),
+            "temp" => temp(span),
+            "net" => net(span),
+        },
+        span,
+    )
 }
 
 pub fn trim_cstyle_null(s: String) -> String {