Deprecate date to-record and date to-table (#14319)

# Description

Implements #11234 based on the comments there:

* (Previously implemented): `into record` handles nanoseconds (as well
as milliseconds and microseconds, which the deprecated commands didn't
support).
* Added deprecation warning to `date to-record` and `date to-table`
* Added new example for `into record` showing the conversion to a table
* Changed `std/dt` to use `into record`
* Added "Deprecated" category back to nu-protocol::Signature
* Assigned the deprecated commands to the Deprecated category so be
categorized properly in the online Doc.

# User-Facing Changes

Deprecated command warning

# Tests + Formatting

- 🟢 `toolkit fmt`
- 🟢 `toolkit clippy`
- 🟢 `toolkit test`
- 🟢 `toolkit test stdlib`

# After Submitting

Searched doc for existing uses of `date to-record` and `date to-table`:

* For primary English-language docs, there are no uses other than in the
auto-generated command help, which will be updated based on this PR
* Other language translations appear to have an old use in several
places and will need to be updated to match the English-language doc.

crates/nu-command/src/conversions/into/record.rs

@@ -99,6 +99,11 @@ impl Command for SubCommand {
                     "timezone" => Value::test_string("+02:00"),
                 })),
             },
+            Example {
+                description: "convert date components to table columns",
+                example: "2020-04-12T22:10:57+02:00 | into record | transpose | transpose -r",
+                result: None,
+            },
         ]
     }
 }

crates/nu-command/src/date/to_record.rs

@@ -1,6 +1,7 @@
 use crate::date::utils::parse_date_from_string;
 use chrono::{DateTime, Datelike, FixedOffset, Local, Timelike};
 use nu_engine::command_prelude::*;
+use nu_protocol::{report_parse_warning, ParseWarning};
 
 #[derive(Clone)]
 pub struct SubCommand;
@@ -17,7 +18,7 @@ impl Command for SubCommand {
                 (Type::String, Type::record()),
             ])
             .allow_variants_without_examples(true) // https://github.com/nushell/nushell/issues/7032
-            .category(Category::Date)
+            .category(Category::Deprecated)
     }
 
     fn description(&self) -> &str {
@@ -35,6 +36,17 @@ impl Command for SubCommand {
         call: &Call,
         input: PipelineData,
     ) -> Result<PipelineData, ShellError> {
+        let head = call.head;
+        report_parse_warning(
+            &StateWorkingSet::new(engine_state),
+            &ParseWarning::DeprecatedWarning {
+                old_command: "date to-record".into(),
+                new_suggestion: "see `into record` command examples".into(),
+                span: head,
+                url: "`help into record`".into(),
+            },
+        );
+
         let head = call.head;
         // This doesn't match explicit nulls
         if matches!(input, PipelineData::Empty) {

crates/nu-command/src/date/to_table.rs

@@ -1,6 +1,7 @@
 use crate::date::utils::parse_date_from_string;
 use chrono::{DateTime, Datelike, FixedOffset, Local, Timelike};
 use nu_engine::command_prelude::*;
+use nu_protocol::{report_parse_warning, ParseWarning};
 
 #[derive(Clone)]
 pub struct SubCommand;
@@ -17,7 +18,7 @@ impl Command for SubCommand {
                 (Type::String, Type::table()),
             ])
             .allow_variants_without_examples(true) // https://github.com/nushell/nushell/issues/7032
-            .category(Category::Date)
+            .category(Category::Deprecated)
     }
 
     fn description(&self) -> &str {
@@ -36,6 +37,16 @@ impl Command for SubCommand {
         input: PipelineData,
     ) -> Result<PipelineData, ShellError> {
         let head = call.head;
+        report_parse_warning(
+            &StateWorkingSet::new(engine_state),
+            &ParseWarning::DeprecatedWarning {
+                old_command: "date to-table".into(),
+                new_suggestion: "see `into record` command examples".into(),
+                span: head,
+                url: "`help into record`".into(),
+            },
+        );
+
         // This doesn't match explicit nulls
         if matches!(input, PipelineData::Empty) {
             return Err(ShellError::PipelineEmpty { dst_span: head });

crates/nu-protocol/src/signature.rs

@@ -44,6 +44,7 @@ pub enum Category {
     Date,
     Debug,
     Default,
+    Deprecated,
     Removed,
     Env,
     Experimental,
@@ -79,6 +80,7 @@ impl std::fmt::Display for Category {
             Category::Date => "date",
             Category::Debug => "debug",
             Category::Default => "default",
+            Category::Deprecated => "deprecated",
             Category::Removed => "removed",
             Category::Env => "env",
             Category::Experimental => "experimental",

crates/nu-std/std/dt/mod.nu

@@ -120,8 +120,8 @@ export def datetime-diff [
             }
         }
     }
-    let from_expanded = ($later | date to-timezone utc | date to-record)
+    let from_expanded = ($later | date to-timezone utc | into record)
-    let to_expanded = ($earlier | date to-timezone utc | date to-record)
+    let to_expanded = ($earlier | date to-timezone utc | into record)
 
     mut result = { year: ($from_expanded.year - $to_expanded.year), month: ($from_expanded.month - $to_expanded.month), day:0, hour:0, minute:0, second:0, millisecond:0, microsecond:0, nanosecond:0}