[Physical Keyboard] Add flag for keyboard a11y new page features

Bug: 345399212
Test: N/A
Flags: com.android.settings.keyboard.keyboard_and_touchpad_a11y_new_page_enabled
Change-Id: I03a6c7bbb042f90761838724a0097f35b008449c

Android.bp

@@ -113,6 +113,7 @@ android_library {
         "telephony_flags_core_java_lib",
         "setupdesign-lottie-loading-layout",
         "device_policy_aconfig_flags_lib",
+        "keyboard_flags_lib",
     ],
 
     plugins: ["androidx.room_room-compiler-plugin"],

aconfig/Android.bp

@@ -66,3 +66,15 @@ java_aconfig_library {
     name: "development_settings_flag_lib",
     aconfig_declarations: "development_settings_flags",
 }
+
+aconfig_declarations {
+    name: "keyboard_flags",
+    package: "com.android.settings.keyboard",
+    container: "system_ext",
+    srcs: ["keyboard/*.aconfig"],
+}
+
+java_aconfig_library {
+    name: "keyboard_flags_lib",
+    aconfig_declarations: "keyboard_flags",
+}

aconfig/keyboard/settings_physical_keyboard_a11y_features.aconfig

@@ -0,0 +1,9 @@
+package: "com.android.settings.keyboard"
+container: "system_ext"
+
+flag {
+  name: "keyboard_and_touchpad_a11y_new_page_enabled"
+  namespace: "input"
+  description: "This flag enables or disables new page for physical keyboard and touchpad a11y features"
+  bug: "345399212"
+}