add special emoji handling for debug --raw (#11368)

# Description

This PR add special handling in `debug -r` for emoji's so that it prints
the code points.

### Before
```nushell
❯ emoji --list | where name =~ farmer | reject utf8_bytes | get 0.emoji | debug -r
String {
    val: "🧑\u{200d}🌾",
    internal_span: Span {
        start: 0,
        end: 0,
    },
}
```

### After
```nushell
❯ emoji --list | where name =~ farmer | reject utf8_bytes | get 0.emoji | debug -r
String {
    val: "\\u{1f9d1}\\u{200d}\\u{1f33e}",
    internal_span: Span {
        start: 0,
        end: 0,
    },
}
```

# User-Facing Changes
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crates/nu-protocol/src/value/mod.rs

@@ -20,8 +20,9 @@ pub use custom_value::CustomValue;
 use fancy_regex::Regex;
 pub use from_value::FromValue;
 pub use lazy_record::LazyRecord;
-use nu_utils::locale::get_system_locale_string;
-use nu_utils::{get_system_locale, IgnoreCaseExt};
+use nu_utils::{
+    contains_emoji, get_system_locale, locale::get_system_locale_string, IgnoreCaseExt,
+};
 use num_format::ToFormattedString;
 pub use range::*;
 pub use record::Record;
@@ -789,7 +790,20 @@ impl Value {
 
     /// Convert Value into a debug string
     pub fn debug_value(&self) -> String {
-        format!("{self:#?}")
+        match self {
+            Value::String { val, .. } => {
+                if contains_emoji(val) {
+                    // This has to be an emoji, so let's display the code points that make it up.
+                    format!(
+                        "{:#?}",
+                        Value::string(val.escape_unicode().to_string(), self.span())
+                    )
+                } else {
+                    format!("{self:#?}")
+                }
+            }
+            _ => format!("{self:#?}"),
+        }
     }
 
     /// Convert Value into a parsable string (quote strings)

crates/nu-utils/src/emoji.rs

@@ -0,0 +1,16 @@
+pub fn contains_emoji(val: &str) -> bool {
+    // Let's do some special handling for emojis
+    const ZERO_WIDTH_JOINER: &str = "\u{200d}";
+    const VARIATION_SELECTOR_16: &str = "\u{fe0f}";
+    const SKIN_TONES: [&str; 5] = [
+        "\u{1f3fb}", // Light Skin Tone
+        "\u{1f3fc}", // Medium-Light Skin Tone
+        "\u{1f3fd}", // Medium Skin Tone
+        "\u{1f3fe}", // Medium-Dark Skin Tone
+        "\u{1f3ff}", // Dark Skin Tone
+    ];
+
+    val.contains(ZERO_WIDTH_JOINER)
+        || val.contains(VARIATION_SELECTOR_16)
+        || SKIN_TONES.iter().any(|skin_tone| val.contains(skin_tone))
+}

crates/nu-utils/src/lib.rs

@@ -1,6 +1,7 @@
 mod casing;
 pub mod ctrl_c;
 mod deansi;
+pub mod emoji;
 pub mod locale;
 pub mod utils;
 
@@ -14,3 +15,4 @@ pub use casing::IgnoreCaseExt;
 pub use deansi::{
     strip_ansi_likely, strip_ansi_string_likely, strip_ansi_string_unlikely, strip_ansi_unlikely,
 };
+pub use emoji::contains_emoji;