feat(reddit): add hide-promoted patch (#419)

Co-authored-by: oSumAtrIX <johan.melkonyan1@web.de>

app/src/main/java/app/revanced/reddit/patches/FilterPromotedLinksPatch.java

@@ -0,0 +1,26 @@
+package app.revanced.reddit.patches;
+
+import com.reddit.domain.model.ILink;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public final class FilterPromotedLinksPatch {
+    /**
+     * Filters list from promoted links.
+     **/
+    public static List<?> filterChildren(final Iterable<?> links) {
+        final List<Object> filteredList = new ArrayList<>();
+
+        for (Object item : links) {
+            if (!(item instanceof ILink)) continue;
+
+            final var link = (ILink) item;
+            final var isPromotedAd = link.getPromoted();
+
+            if (!isPromotedAd) filteredList.add(item);
+        }
+
+        return filteredList;
+    }
+}

dummy/src/main/java/com/reddit/domain/model/ILink.java

@@ -0,0 +1,7 @@
+package com.reddit.domain.model;
+
+public class ILink {
+    public boolean getPromoted() {
+        throw new UnsupportedOperationException("Stub");
+    }
+}