Patch restore lead trail space bg color (#10351)

```nu
 $env.config.color_config.leading_trailing_space_bg = { bg: 'white' }; [[a b, 'c   ']; ['  1  ' '    2' '3    '] ['  4  ' "hello   \n  world  " ['  1  ' 2 [1 '  2  ' 3]]]] | table --expand
```


![image](https://github.com/nushell/nushell/assets/20165848/01a35042-0e36-4c51-99a9-3011fabb551b)

ref: #2794
close: #10317

note: test are not actually make scenes cause `nu!` strips colors.
(Ideally it would need a flag to not do so)
note: It does does does ... slower down quite a bit rendering... (

PS: Maybe it's better being a flag to `table` rather then a
configuration option?
PS: I am not sure why the logic was removed in a first place

crates/nu-table/src/common.rs

@@ -62,6 +62,16 @@ pub fn get_index_style(style_computer: &StyleComputer) -> TextStyle {
     )
 }
 
+pub fn get_leading_trailing_space_style(style_computer: &StyleComputer) -> TextStyle {
+    TextStyle::with_style(
+        Alignment::Right,
+        style_computer.compute(
+            "leading_trailing_space_bg",
+            &Value::string("", Span::unknown()),
+        ),
+    )
+}
+
 pub fn get_value_style(value: &Value, config: &Config, style_computer: &StyleComputer) -> NuText {
     match value {
         // Float precision is required here.