[focus] For 5837 - Add Autoplay settings screen

Until now only audible videos were blocked by default, this commit
add a new settings screen to let the user to choose the state of Autoplay

X-Channel-Revision: [main] mozilla-mobile/android-components@96444dd
X-Channel-Revision: [main] mozilla-mobile/fenix@d039188
X-Channel-Revision: [main] mozilla-mobile/focus-android@a9a09b1
X-Channel-Converted-Revision: [main] mozilla-mobile/firefox-android@ae83982

Author: Ionut Cristian Bedregeanu

_meta/mozilla-mobile-firefox-android-focus-android.json

@@ -1,6 +1,6 @@
 {
   "name": "mozilla-mobile/firefox-android/focus-android",
   "revs": {
-    "main": "b183161a44745a31b91d447225577fc698ac158e"
+    "main": "ae839829b76cfd89a6387b82bb16554a3286cb83"
   }
 }

mozilla-mobile/focus-android/app/src/main/res/values/strings.xml

@@ -607,6 +607,24 @@
     <!-- Title of Advanced Setting category -->
     <string name="preference_category_advanced">Advanced</string>
 
+    <!-- Preference for site permissions -->
+    <string name="preference_site_permissions">Site permissions</string>
+
+    <!-- Preference for autoplay -->
+    <string name="preference_autoplay">Autoplay</string>
+
+    <!-- Preference for allow autoplay audio and video-->
+    <string name="preference_allow_audio_video_autoplay">Allow audio and video</string>
+
+    <!-- Preference for block autoplay audio only-->
+    <string name="preference_block_autoplay_audio_only">Block audio only</string>
+
+    <!-- Preference summary for block autoplay audio only-->
+    <string name="preference_block_autoplay_audio_only_summary">Recommended</string>
+
+    <!-- Preference for block autoplay audio and video-->
+    <string name="preference_block_autoplay_audio_video">Block audio and video</string>
+
     <!-- Preference for studies -->
     <string name="preference_studies">Studies</string>