New J2K: add better support of implicit functional interfaces

#KT-32702 fixed
#KT-19327 fixed

nj2k/testData/newJ2k/issues/kt-19327.java

@@ -0,0 +1,10 @@
+// RUNTIME_WITH_FULL_JDK
+
+import java.util.Collection;
+import java.util.stream.Collectors;
+
+class JavaCode {
+    public String toJSON(Collection<Integer> collection) {
+        return "[" + collection.stream().map(Object::toString).collect(Collectors.joining(", ")) + "]";
+    }
+}

nj2k/testData/newJ2k/issues/kt-19327.kt

@@ -0,0 +1,10 @@
+// ERROR: Unresolved reference: stream
+// ERROR: Unresolved reference: stream
+// ERROR: Unresolved reference: Collectors
+import java.util.stream.Collectors
+
+internal class JavaCode {
+    fun toJSON(collection: Collection<Int?>): String {
+        return "[" + collection.stream().map({ obj: Object -> obj.toString() }).collect(Collectors.joining(", ")).toString() + "]"
+    }
+}

nj2k/testData/newJ2k/issues/kt-32702.java

@@ -0,0 +1,11 @@
+// RUNTIME_WITH_FULL_JDK
+
+import java.util.*;
+
+class Test {
+    public void context() {
+        List<Double> items = new ArrayList<>();
+        items.add(1.0);
+        items.forEach(System.out::println);
+    }
+}

nj2k/testData/newJ2k/issues/kt-32702.kt

@@ -0,0 +1,10 @@
+import java.util.ArrayList
+import java.util.function.Consumer
+
+internal class Test {
+    fun context() {
+        val items: MutableList<Double> = ArrayList()
+        items.add(1.0)
+        items.forEach(Consumer { o: Double -> println(o) })
+    }
+}