Fix ignored clippy lints (#12160)

# Description
Fixes some ignored clippy lints.

# User-Facing Changes
Changes some signatures and return types to `&dyn Command` instead of
`&Box<dyn Command`, but I believe this is only an internal change.

crates/nu-command/src/debug/inspect_table.rs

@@ -48,7 +48,6 @@ pub fn build_table(value: Value, description: String, termsize: usize) -> String
 
     add_padding_to_widths(&mut widths);
 
-    #[allow(clippy::manual_clamp)]
     let width = val_table_width.max(desc_table_width).min(termsize);
 
     let mut desc_table = Table::from_iter([[String::from("description"), desc]]);