Add wifi metered controls in wifi settings.

1. Add it in wifi detail page
2. Add it in wifi dialog
2. Remove it in "Mobile network" page

Bug: 68030417
Test: RunSettingsRoboTests
Change-Id: I2e001c55f3c6c75a660e429732dfbece97b0ca9e

res/values/arrays.xml

@@ -1063,4 +1063,16 @@
         <item>zen_mode_from_none</item>
     </string-array>
 
+    <string-array name="wifi_metered_entries">
+        <item>Use network preference</item>
+        <item>Treat as metered</item>
+        <item>Treat as unmetered</item>
+    </string-array>
+
+    <string-array name="wifi_metered_values" translatable="false">
+        <item>0</item>
+        <item>1</item>
+        <item>2</item>
+    </string-array>
+
 </resources>