allow sort-by to work with records (nushell#10870)

# Description

This PR restores and old functionality that must of been broken with the
input_output_types() updating. It allows commands like this to work
again.

```nushell
open $nu.history-path | 
  get history.command_line | 
  split column ' ' cmd | 
  group-by cmd --to-table | 
  update items {|u| $u.items | length} | 
  sort-by items -r | 
  first 10 | 
  table -n 1
```
output
```
╭#─┬group─┬items╮
│1 │exit  │ 3004│
│2 │ls    │ 2591│
│3 │git   │ 1678│
│4 │help  │ 1549│
│5 │open  │ 1374│
│6 │cd    │ 1186│
│7 │cargo │  944│
│8 │let   │  784│
│9 │source│  755│
│10│z     │  486│
╰#─┴group─┴items╯
```

# User-Facing Changes
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crates/nu-command/src/filters/sort_by.rs

@@ -17,11 +17,12 @@ impl Command for SortBy {
     fn signature(&self) -> nu_protocol::Signature {
         Signature::build("sort-by")
             .input_output_types(vec![
-                (Type::Table(vec![]), Type::Table(vec![])),
                 (
                     Type::List(Box::new(Type::Any)),
                     Type::List(Box::new(Type::Any)),
                 ),
+                (Type::Record(vec![]), Type::Table(vec![])),
+                (Type::Table(vec![]), Type::Table(vec![])),
             ])
             .rest("columns", SyntaxShape::Any, "the column(s) to sort by")
             .switch("reverse", "Sort in reverse order", Some('r'))