Extend Vim default keybindings (#10461)

This implements some of #10457.

Release notes:

- Added `g c c` and `g c` to Vim keybindings to toggle comments in
normal and visual mode respectively.
- Added `g ]` and `g [` to Vim keybindings to go to next and previous
diagnostic error.
- Changed `[ x` and `] x` (which select larger/smaller syntax node) in
Vim mode to also work in visual mode.

assets/keymaps/vim.json

@@ -234,6 +234,8 @@
           "displayLines": true
         }
       ],
+      "g ]": "editor::GoToDiagnostic",
+      "g [": "editor::GoToPrevDiagnostic",
       "shift-h": "vim::WindowTop",
       "shift-m": "vim::WindowMiddle",
       "shift-l": "vim::WindowBottom",
@@ -367,6 +369,15 @@
       "< <": "vim::Outdent",
       "ctrl-pagedown": "pane::ActivateNextItem",
       "ctrl-pageup": "pane::ActivatePrevItem",
+      // tree-sitter related commands
+      "[ x": "editor::SelectLargerSyntaxNode",
+      "] x": "editor::SelectSmallerSyntaxNode"
+    }
+  },
+  {
+    "context": "Editor && vim_mode == visual && vim_operator == none && !VimWaiting",
+    "bindings": {
+      // tree-sitter related commands
       "[ x": "editor::SelectLargerSyntaxNode",
       "] x": "editor::SelectSmallerSyntaxNode"
     }
@@ -532,6 +543,18 @@
       ]
     }
   },
+  {
+    "context": "Editor && vim_mode == normal",
+    "bindings": {
+      "g c c": "editor::ToggleComments"
+    }
+  },
+  {
+    "context": "Editor && vim_mode == visual",
+    "bindings": {
+      "g c": "editor::ToggleComments"
+    }
+  },
   {
     "context": "Editor && vim_mode == insert",
     "bindings": {