Add Discord community version (64-bit only)

- Added realracing3-community.apk (71.57 MB)
- Removed 32-bit support (armeabi-v7a)
- Only includes arm64-v8a libraries
- Decompiled source code included
- Added README-community.md with analysis

decompiled-community/sources/com/mbridge/msdk/mbnative/c/b.java

@@ -0,0 +1,17 @@
+package com.mbridge.msdk.mbnative.c;
+
+import android.content.Context;
+import com.mbridge.msdk.out.MBCommonHandler;
+import java.util.Map;
+
+/* loaded from: classes4.dex */
+public abstract class b extends MBCommonHandler {
+    public static String TAG = "DemandMBNativeHandler";
+
+    public b() {
+    }
+
+    public b(Map<String, Object> map, Context context) {
+        super(map, context);
+    }
+}