Add a qmk format-json command that will format JSON files (#12372)

* Add a command to format json files

* change to work after rebase

* add test for qmk format-json

* add documentation for qmk format-json

* Update lib/python/qmk/cli/format/json.py

lib/python/qmk/tests/minimal_info.json

@@ -0,0 +1,13 @@
+{
+    "keyboard_name": "tester",
+    "maintainer": "qmk",
+    "height": 5,
+    "width": 15,
+    "layouts": {
+        "LAYOUT": {
+            "layout": [
+                { "label": "KC_A", "x": 0, "y": 0, "matrix": [0, 0] }
+            ]
+        }
+    }
+}