Implement Undo & Redo keyboard shortcuts (#382)

* Implement `Undo` & `Redo` keyboard shortcuts

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update selector to `.jp-jupytercad-panel`

* Remove logging statements

* Use `body` as selector for all keybindings for now

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

packages/base/src/keybindings.json

@@ -1,12 +1,17 @@
 [
   {
-    "command": "jupytercad:removeObject",
-    "keys": ["Delete"],
-    "selector": ".jp-jupytercad-panel"
+    "command": "jupytercad:undo",
+    "keys": ["Accel Z"],
+    "selector": "body"
+  },
+  {
+    "command": "jupytercad:redo",
+    "keys": ["Accel Y"],
+    "selector": "body"
   },
   {
     "command": "jupytercad:removeObject",
     "keys": ["Delete"],
-    "selector": ".jpcad-treeview-wrapper"
+    "selector": "body"
   }
 ]