remove a few unnecessary allocations (#9176)

# Description

Change the parser a little bit so it does less allocations when it's
parsing, specifically when parsing lists/tables

# User-Facing Changes
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crates/nu-parser/src/parser.rs

@@ -4006,11 +4006,8 @@ pub fn parse_table_expression(
                 } => {
                     let mut table_headers = vec![];
 
-                    let headers = parse_value(
+                    let headers =
-                        working_set,
+                        parse_list_expression(working_set, command.parts[0], &SyntaxShape::Any);
-                        command.parts[0],
-                        &SyntaxShape::List(Box::new(SyntaxShape::Any)),
-                    );
 
                     if let Expression {
                         expr: Expr::List(headers),
@@ -4028,11 +4025,8 @@ pub fn parse_table_expression(
                         } => {
                             let mut rows = vec![];
                             for part in &command.parts {
-                                let values = parse_value(
+                                let values =
-                                    working_set,
+                                    parse_list_expression(working_set, *part, &SyntaxShape::Any);
-                                    *part,
-                                    &SyntaxShape::List(Box::new(SyntaxShape::Any)),
-                                );
                                 if let Expression {
                                     expr: Expr::List(values),
                                     span,