Moving all sources that are shared between Launcher and TAPL in one directory

This will help SysUI test team (who uses TAPL) to set up Gradle build for their tests.

Bug: 202567877, 234414088
Test: presubmit
Change-Id: I3d923ea4b54d1a4c3d2b345be09692727d30433e
diff --git a/src/com/android/launcher3/LauncherModel.java b/src/com/android/launcher3/LauncherModel.java
index de0d300..f790789 100644
--- a/src/com/android/launcher3/LauncherModel.java
+++ b/src/com/android/launcher3/LauncherModel.java
@@ -63,7 +63,7 @@
 import com.android.launcher3.pm.PackageInstallInfo;
 import com.android.launcher3.pm.UserCache;
 import com.android.launcher3.shortcuts.ShortcutRequest;
-import com.android.launcher3.testing.TestProtocol;
+import com.android.launcher3.testing.shared.TestProtocol;
 import com.android.launcher3.util.IntSet;
 import com.android.launcher3.util.ItemInfoMatcher;
 import com.android.launcher3.util.PackageUserKey;