For #9506: Create show open in app banner preference.

app/src/main/java/org/mozilla/fenix/utils/Settings.kt

@@ -663,6 +663,11 @@ class Settings(private val appContext: Context) : PreferencesHolder {
         default = false
     )
 
+    var shouldShowOpenInAppBanner by booleanPreference(
+        appContext.getPreferenceKey(R.string.pref_key_should_show_open_in_app_banner),
+        default = true
+    )
+
     @VisibleForTesting(otherwise = PRIVATE)
     internal val trackingProtectionOnboardingCount = counterPreference(
         appContext.getPreferenceKey(R.string.pref_key_tracking_protection_onboarding),

app/src/main/res/values/preference_keys.xml

@@ -182,6 +182,9 @@
     <!-- A value  of `true` means the PWA dialog has been showed or user already has PWAs installed -->
     <string name="pref_key_user_knows_about_pwa" translatable="false">pref_key_user_knows_about_pwa</string>
 
+    <!-- A value  of `true` means the Open In App Banner has not been shown yet -->
+    <string name="pref_key_should_show_open_in_app_banner" translatable="false">pref_key_should_show_open_in_app_banner</string>
+
     <string name="pref_key_migrating_from_fenix_nightly_tip" translatable="false">pref_key_migrating_from_fenix_nightly_tip</string>
     <string name="pref_key_migrating_from_firefox_nightly_tip" translatable="false">pref_key_migrating_from_firefox_nightly_tip</string>
     <string name="pref_key_migrating_from_fenix_tip" translatable="false">pref_key_migrating_from_fenix_tip</string>