Box ShellError in Value::Error (#8375)

# Description

Our `ShellError` at the moment has a `std::mem::size_of<ShellError>` of
136 bytes (on AMD64). As a result `Value` directly storing the struct
also required 136 bytes (thanks to alignment requirements).

This change stores the `Value::Error` `ShellError` on the heap.

Pro:
- Value now needs just 80 bytes
- Should be 1 cacheline less (still at least 2 cachelines)

Con:
- More small heap allocations when dealing with `Value::Error`
  - More heap fragmentation
  - Potential for additional required memcopies

# Further code changes

Includes a small refactor of `try` due to a type mismatch in its large
match.

# User-Facing Changes

None for regular users.

Plugin authors may have to update their matches on `Value` if they use
`nu-protocol`

Needs benchmarking to see if there is a benefit in real world workloads.
**Update** small improvements in runtime for workloads with high volume
of values. Significant reduction in maximum resident set size, when many
values are held in memory.

# Tests + Formatting

crates/nu-command/src/strings/format/command.rs

@@ -230,7 +230,7 @@ fn format(
                             }
                         }
                     }
-                    Value::Error { error } => return Err(error.clone()),
+                    Value::Error { error } => return Err(*error.clone()),
                     _ => {
                         return Err(ShellError::OnlySupportsThisInputType {
                             exp_input_type: "record".to_string(),
@@ -249,7 +249,7 @@ fn format(
         }
         // Unwrapping this ShellError is a bit unfortunate.
         // Ideally, its Span would be preserved.
-        Value::Error { error } => Err(error),
+        Value::Error { error } => Err(*error),
         _ => Err(ShellError::OnlySupportsThisInputType {
             exp_input_type: "record".to_string(),
             wrong_type: data_as_value.get_type().to_string(),

crates/nu-command/src/strings/format/filesize.rs

@@ -106,12 +106,12 @@ fn format_value_impl(val: &Value, arg: &Arguments, span: Span) -> Value {
         },
         Value::Error { .. } => val.clone(),
         _ => Value::Error {
-            error: ShellError::OnlySupportsThisInputType {
+            error: Box::new(ShellError::OnlySupportsThisInputType {
                 exp_input_type: "filesize".into(),
                 wrong_type: val.get_type().to_string(),
                 dst_span: span,
                 src_span: val.expect_span(),
-            },
+            }),
         },
     }
 }