Implement Indent & Outdent as operators (#12430)

Release Notes:

- Fixes [#9697](https://github.com/zed-industries/zed/issues/9697).

Implements `>` and `<` with motions and text objects.
Works with repeat action `.`

crates/vim/src/state.rs

@@ -61,6 +61,8 @@ pub enum Operator {
     DeleteSurrounds,
     Mark,
     Jump { line: bool },
+    Indent,
+    Outdent,
 }
 
 #[derive(Default, Clone)]
@@ -266,6 +268,8 @@ impl Operator {
             Operator::Mark => "m",
             Operator::Jump { line: true } => "'",
             Operator::Jump { line: false } => "`",
+            Operator::Indent => ">",
+            Operator::Outdent => "<",
         }
     }