Convert ShellError::UnsupportedInput to named fields (#10971)

# Description

This is easy to do with rust-analyzer, but I didn't want to just pump
these all out without feedback.

Part of #10700

# User-Facing Changes

None

# Tests + Formatting

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

# After Submitting

N/A

---------

Co-authored-by: Stefan Holderbach <sholderbach@users.noreply.github.com>

crates/nu-command/src/charting/hashable_value.rs

@@ -102,12 +102,12 @@ impl HashableValue {
 
             // Explicitly propagate errors instead of dropping them.
             Value::Error { error, .. } => Err(*error),
-            _ => Err(ShellError::UnsupportedInput(
-                "input value is not hashable".into(),
-                format!("input type: {:?}", value.get_type()),
-                span,
-                value.span(),
-            )),
+            _ => Err(ShellError::UnsupportedInput {
+                msg: "input value is not hashable".into(),
+                input: format!("input type: {:?}", value.get_type()),
+                msg_span: span,
+                input_span: value.span(),
+            }),
         }
     }
 

crates/nu-command/src/charting/histogram.rs

@@ -162,14 +162,9 @@ fn run_histogram(
                         let t = v.get_type();
                         let span = v.span();
                         inputs.push(HashableValue::from_value(v, head_span).map_err(|_| {
-                        ShellError::UnsupportedInput(
-                            "Since --column-name was not provided, only lists of hashable values are supported.".to_string(),
-                            format!(
+                        ShellError::UnsupportedInput { msg: "Since --column-name was not provided, only lists of hashable values are supported.".to_string(), input: format!(
                                 "input type: {t:?}"
-                            ),
-                            head_span,
-                            span,
-                        )
+                            ), msg_span: head_span, input_span: span }
                     })?)
                     }
                 }