Boxes record for smaller Value enum. (#12252)

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Boxes `Record` inside `Value` to reduce memory usage, `Value` goes from
`72` -> `56` bytes after this change.
# User-Facing Changes
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helps us keep track of breaking changes. -->

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crates/nu-protocol/src/value/from_value.rs

@@ -538,7 +538,7 @@ impl FromValue for Vec<Value> {
 impl FromValue for Record {
     fn from_value(v: Value) -> Result<Self, ShellError> {
         match v {
-            Value::Record { val, .. } => Ok(val),
+            Value::Record { val, .. } => Ok(*val),
             v => Err(ShellError::CantConvert {
                 to_type: "Record".into(),
                 from_type: v.get_type().to_string(),

crates/nu-protocol/src/value/mod.rs

@@ -106,7 +106,7 @@ pub enum Value {
         internal_span: Span,
     },
     Record {
-        val: Record,
+        val: Box<Record>,
         // note: spans are being refactored out of Value
         // please use .span() instead of matching this span value
         #[serde(rename = "span")]
@@ -534,7 +534,7 @@ impl Value {
     /// Unwraps the inner [`Record`] value or returns an error if this `Value` is not a record
     pub fn into_record(self) -> Result<Record, ShellError> {
         if let Value::Record { val, .. } = self {
-            Ok(val)
+            Ok(*val)
         } else {
             self.cant_convert_to("record")
         }
@@ -1994,7 +1994,7 @@ impl Value {
 
     pub fn record(val: Record, span: Span) -> Value {
         Value::Record {
-            val,
+            val: Box::new(val),
             internal_span: span,
         }
     }