java: Stop using dev.rikka.hidden.stub

- We dont need the whole dev.rikka.hidden.stub library so just remove it and simplify dependencies.
- We already have our own stub package so we can just include the missing stubs that we want directly in it.

Signed-off-by: Dakkshesh <beakthoven@gmail.com>

stub/src/main/java/android/content/pm/BaseParceledListSlice.java

@@ -0,0 +1,15 @@
+/*
+ * Copyright 2025 Dakkshesh <beakthoven@gmail.com>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package android.content.pm;
+
+import java.util.List;
+
+abstract class BaseParceledListSlice<T> {
+
+    public List<T> getList() {
+        throw new RuntimeException("");
+    }
+}

stub/src/main/java/android/content/pm/ParceledListSlice.java

@@ -0,0 +1,15 @@
+/*
+ * Copyright 2025 Dakkshesh <beakthoven@gmail.com>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package android.content.pm;
+
+import java.util.List;
+
+public class ParceledListSlice<T> extends BaseParceledListSlice<T> {
+
+    public ParceledListSlice(List<T> list) {
+        throw new RuntimeException("");
+    }
+}