Add an option to move header on borders (#9796)

A patch to play with.
Need to make a few tests after all.

The question is what shall be done with `table.mode = none`, as it has
no borders.

```nu
$env.config.table.move_header = true
```


![image](https://github.com/nushell/nushell/assets/20165848/cdcffa6d-989c-4368-a436-fdf7d3400e31)

cc: @fdncred

---------

Signed-off-by: Maxim Zhiburt <zhiburt@gmail.com>

crates/nu-table/src/util.rs

@@ -42,3 +42,8 @@ pub fn string_truncate(text: &str, width: usize) -> String {
 
     Truncate::truncate_text(line, width).into_owned()
 }
+
+pub fn clean_charset(text: &str) -> String {
+    // todo: optimize, I bet it can be done in 1 path
+    text.replace('\t', "    ").replace('\r', "")
+}