Move Slice code to spa/slice folder & add tests.

Bug: 244122804
Test: unit-test & local build gallery
Change-Id: I61baac3e52e1ac3d7b674bc8366bee0074586115
diff --git a/packages/SettingsLib/Spa/gallery/AndroidManifest.xml b/packages/SettingsLib/Spa/gallery/AndroidManifest.xml
index a051ffe..71c52d9 100644
--- a/packages/SettingsLib/Spa/gallery/AndroidManifest.xml
+++ b/packages/SettingsLib/Spa/gallery/AndroidManifest.xml
@@ -42,7 +42,7 @@
             android:exported="false">
         </provider>
 
-        <provider android:name="com.android.settingslib.spa.framework.SpaSliceProvider"
+        <provider android:name="com.android.settingslib.spa.slice.SpaSliceProvider"
             android:authorities="com.android.spa.gallery.slice.provider"
             android:exported="true" >
             <intent-filter>
@@ -52,7 +52,7 @@
         </provider>
 
         <receiver
-            android:name="com.android.settingslib.spa.framework.SpaSliceBroadcastReceiver"
+            android:name="com.android.settingslib.spa.slice.SpaSliceBroadcastReceiver"
             android:exported="false">
         </receiver>