Kapt3: Allow function overloads based on return type (KT-14996). Fix wrong facade class name inside the default package

plugins/kapt3/testData/converter/kt14996.kt

@@ -0,0 +1,7 @@
+fun crashMe(values: List<String>): String {
+    throw UnsupportedOperationException()
+}
+
+fun crashMe(values: List<CharSequence>): CharSequence {
+    throw UnsupportedOperationException()
+}

plugins/kapt3/testData/converter/kt14996.txt

@@ -0,0 +1,14 @@
+public final class Kt14996Kt {
+
+    public Kt14996Kt() {
+        super();
+    }
+
+    public static final java.lang.String crashMe(java.util.List<java.lang.String> values) {
+        return null;
+    }
+
+    public static final java.lang.CharSequence crashMe(java.util.List<? extends java.lang.CharSequence> values) {
+        return null;
+    }
+}