Add Fit Group to Contents keybind (#1658)

* Add Fit Group to Nodes keyboard command

Fits all selected groups.

* nit - Rename

* Move to commandStore & Playwright test

* nit

* nit

* Update test expectations [skip ci]

---------

Co-authored-by: huchenlei <huchenlei@proton.me>
Co-authored-by: github-actions <github-actions@github.com>

browser_tests/assets/oversized_group.json

@@ -0,0 +1,90 @@
+{
+  "last_node_id": 9,
+  "last_link_id": 9,
+  "nodes": [
+    {
+      "id": 3,
+      "type": "KSampler",
+      "pos": [
+        37,
+        98
+      ],
+      "size": [
+        315,
+        262
+      ],
+      "flags": {},
+      "order": 0,
+      "mode": 0,
+      "inputs": [
+        {
+          "name": "model",
+          "type": "MODEL",
+          "link": null
+        },
+        {
+          "name": "positive",
+          "type": "CONDITIONING",
+          "link": null
+        },
+        {
+          "name": "negative",
+          "type": "CONDITIONING",
+          "link": null
+        },
+        {
+          "name": "latent_image",
+          "type": "LATENT",
+          "link": null
+        }
+      ],
+      "outputs": [
+        {
+          "name": "LATENT",
+          "type": "LATENT",
+          "links": [],
+          "slot_index": 0
+        }
+      ],
+      "properties": {
+        "Node name for S&R": "KSampler"
+      },
+      "widgets_values": [
+        156680208700286,
+        "randomize",
+        20,
+        8,
+        "euler",
+        "normal",
+        1
+      ]
+    }
+  ],
+  "links": [],
+  "groups": [
+    {
+      "id": 1,
+      "title": "Group",
+      "bounding": [
+        23,
+        23,
+        900,
+        825
+      ],
+      "color": "#3f789e",
+      "font_size": 24,
+      "flags": {}
+    }
+  ],
+  "config": {},
+  "extra": {
+    "ds": {
+      "scale": 1,
+      "offset": [
+        0,
+        0
+      ]
+    }
+  },
+  "version": 0.4
+}