Migrate features and LTO from rules.mk to data driven (#23302)

keyboards/handwired/uthol/rev2/keyboard.json

@@ -0,0 +1,34 @@
+{
+    "keyboard_name": "UtholTwo",
+    "usb": {
+        "device_version": "0.0.2"
+    },
+    "rgblight": {
+        "led_count": 39,
+        "default": {
+            "hue": 201
+        }
+    },
+    "ws2812": {
+        "pin": "E6"
+    },
+    "build": {
+        "lto": true
+    },
+    "features": {
+        "bootmagic": true,
+        "command": false,
+        "console": false,
+        "extrakey": true,
+        "mousekey": false,
+        "nkro": true,
+        "rgblight": true
+    },
+    "matrix_pins": {
+        "cols": ["D3", "D2", "D1", "D0", "D4", "C6", "D7", "B5", "B4", "B6", "B2", "B3"],
+        "rows": ["B1", "F7", "F6", "F5", "F4"]
+    },
+    "diode_direction": "COL2ROW",
+    "processor": "atmega32u4",
+    "bootloader": "caterina"
+}