allow return to return any nushell value (#10067)

# Description

This PR allows the `return` command to return any nushell value.

### Before

![image](https://github.com/nushell/nushell/assets/343840/2c0a70d7-86e4-4c7f-bd3a-d7c7d74b1c1a)

### After

![image](https://github.com/nushell/nushell/assets/343840/f428d486-4a4f-4058-a29f-7d7a845e08f7)


# User-Facing Changes
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crates/nu-cmd-lang/src/core_commands/return_.rs

@@ -19,7 +19,7 @@ impl Command for Return {
 
     fn signature(&self) -> nu_protocol::Signature {
         Signature::build("return")
-            .input_output_types(vec![(Type::Nothing, Type::Nothing)])
+            .input_output_types(vec![(Type::Nothing, Type::Any)])
             .optional("return_value", SyntaxShape::Any, "optional value to return")
             .category(Category::Core)
     }