Kotlin: add test for Java and Kotlin both extending Map.Entry

Author: smowton

java/ql/test/kotlin/library-tests/kotlin-java-map-entries/C.java

@@ -0,0 +1,3 @@
+import java.util.Map;
+
+public abstract class C<K, V> implements Map.Entry<K, V> { }

java/ql/test/kotlin/library-tests/kotlin-java-map-entries/b.kt

@@ -0,0 +1 @@
+public abstract class B<K, V> : Map.Entry<K, V> { }

java/ql/test/kotlin/library-tests/kotlin-java-map-entries/test.expected

@@ -0,0 +1,2 @@
+| comparingByKey | K | Comparable<? super K> |
+| comparingByValue | V | Comparable<? super V> |

java/ql/test/kotlin/library-tests/kotlin-java-map-entries/test.ql

@@ -0,0 +1,6 @@
+import java
+
+from Method m, TypeVariable param
+where m.getDeclaringType().getQualifiedName() = "java.util.Map$Entry"
+and param = m.(GenericCallable).getATypeParameter()
+select m.toString(), param.toString(), param.getATypeBound().toString()