FIR Java: support Kotlin extension overriding: at last, #KT-29937 Fixed

idea/testData/fir/multiModule/javaInheritsKotlinExtension/jvm/Inheritor.java

@@ -0,0 +1,3 @@
+public class Inheritor extends Second {
+    public void foo(First first, String s, int i) {}
+}