Migrate features from rules.mk to data driven - EFGH (#23248)

keyboards/handwired/gamenum/keyboard.json

@@ -8,6 +8,14 @@
     "pid": "0x5678",
     "device_version": "0.0.1"
   },
+  "features": {
+    "bootmagic": false,
+    "command": true,
+    "console": true,
+    "extrakey": true,
+    "mousekey": true,
+    "nkro": false
+  },
   "matrix_pins": {
     "cols": ["D7", "E6", "B4", "B5"],
     "rows": ["B6", "B2", "B3", "B1", "F7"]

keyboards/handwired/gamenum/rules.mk

@@ -1,11 +0,0 @@
-# Build Options
-#   change yes to no to disable
-#
-BOOTMAGIC_ENABLE = no       # Enable Bootmagic Lite
-MOUSEKEY_ENABLE = yes       # Mouse keys
-EXTRAKEY_ENABLE = yes       # Audio control and System control
-CONSOLE_ENABLE = yes        # Console for debug
-COMMAND_ENABLE = yes        # Commands for debug and configuration
-NKRO_ENABLE = no            # Enable N-Key Rollover
-BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
-AUDIO_ENABLE = no           # Audio output