Add IS_DEBUG to SpaEnvironment

If set to true, this will also enable all the pages under development
(allows browsing and searching).

Bug: 244122804
Test: Manually with Settings
Change-Id: Ibf8f6f832f7f9f16e8224a83b92801635a83e1cb

packages/SettingsLib/Spa/spa/src/com/android/settingslib/spa/framework/common/SettingsPage.kt

@@ -77,9 +77,8 @@ data class SettingsPage(
         return true
     }
 
-    fun isEnabled(): Boolean {
-        return getPageProvider(sppName)?.isEnabled(arguments) ?: false
-    }
+    fun isEnabled(): Boolean =
+        SpaEnvironment.IS_DEBUG || getPageProvider(sppName)?.isEnabled(arguments) ?: false
 
     fun getTitle(): String {
         return getPageProvider(sppName)?.getTitle(arguments) ?: ""

packages/SettingsLib/Spa/spa/src/com/android/settingslib/spa/framework/common/SpaEnvironment.kt

@@ -88,4 +88,13 @@ abstract class SpaEnvironment(context: Context) {
     open val sliceProviderAuthorities: String? = null
 
     // TODO: add other environment setup here.
+    companion object {
+        /**
+         * Whether debug mode is on or off.
+         *
+         * If set to true, this will also enable all the pages under development (allows browsing
+         * and searching).
+         */
+        const val IS_DEBUG = false
+    }
 }