Use Record APIs in nu-protocol/nu-engine (#10917)

# Description
Consequences of #10841

This does not yet make the assumption that columns are always
duplicated. Follow the existing logic here

- Use saner record API in `nu-engine/src/eval.rs`
- Use checked record construction in `nu-engine/src/scope.rs`
- Use `values` iterator in `nu-engine/src/scope.rs`
- Use `columns` iterator in `nu_engine::get_columns()`
- Start using record API in `value/mod.rs`
- Use `.insert` in `eval_const.rs` Record code
- Record API for `eval_const.rs` table code

# User-Facing Changes
None

# Tests + Formatting
None

crates/nu-engine/src/eval.rs

@@ -552,7 +552,7 @@ pub fn eval_expression(
             for (col, val) in fields {
                 // avoid duplicate cols.
                 let col_name = eval_expression(engine_state, stack, col)?.as_string()?;
-                let pos = record.cols.iter().position(|c| c == &col_name);
+                let pos = record.index_of(&col_name);
                 match pos {
                     Some(index) => {
                         return Err(ShellError::ColumnDefinedTwice {
@@ -592,10 +592,7 @@ pub fn eval_expression(
                     row.push(eval_expression(engine_state, stack, expr)?);
                 }
                 output_rows.push(Value::record(
-                    Record {
-                        cols: output_headers.clone(),
-                        vals: row,
-                    },
+                    Record::from_raw_cols_vals(output_headers.clone(), row),
                     expr.span,
                 ));
             }