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/platform/input/input_.rs

@@ -73,12 +73,12 @@ impl Command for Input {
         });
 
         if numchar.item < 1 {
-            return Err(ShellError::UnsupportedInput(
-                "Number of characters to read has to be positive".to_string(),
-                "value originated from here".to_string(),
-                call.head,
-                numchar.span,
-            ));
+            return Err(ShellError::UnsupportedInput {
+                msg: "Number of characters to read has to be positive".to_string(),
+                input: "value originated from here".to_string(),
+                msg_span: call.head,
+                input_span: numchar.span,
+            });
         }
 
         if let Some(prompt) = &prompt {

crates/nu-command/src/platform/input/input_listen.rs

@@ -178,21 +178,21 @@ impl EventTypeFilter {
     }
 
     fn wrong_type_error(head: Span, val: &str, val_span: Span) -> ShellError {
-        ShellError::UnsupportedInput(
-            format!("{} is not a valid event type", val),
-            "value originates from here".into(),
-            head,
-            val_span,
-        )
+        ShellError::UnsupportedInput {
+            msg: format!("{} is not a valid event type", val),
+            input: "value originates from here".into(),
+            msg_span: head,
+            input_span: val_span,
+        }
     }
 
     fn bad_list_error(head: Span, value: &Value) -> ShellError {
-        ShellError::UnsupportedInput(
-            "--types expects a list of strings".to_string(),
-            "value originates from here".into(),
-            head,
-            value.span(),
-        )
+        ShellError::UnsupportedInput {
+            msg: "--types expects a list of strings".to_string(),
+            input: "value originates from here".into(),
+            msg_span: head,
+            input_span: value.span(),
+        }
     }
 
     /// Enable capturing of all events allowed by this filter.