Kotlin: Add stmt/expr support

java/ql/test/kotlin/library-tests/exprs/exprs.expected

@@ -0,0 +1,3 @@
+| exprs.kt:3:12:3:14 | 123 |
+| exprs.kt:3:12:3:20 | ... + ... |
+| exprs.kt:3:18:3:20 | 456 |

java/ql/test/kotlin/library-tests/exprs/exprs.kt

@@ -0,0 +1,5 @@
+
+fun topLevelMethod(x: Int, y: Int): Int {
+    return 123 + 456
+}
+

java/ql/test/kotlin/library-tests/exprs/exprs.ql

@@ -0,0 +1,5 @@
+import java
+
+from Expr e
+select e
+

java/ql/test/kotlin/library-tests/stmts/stmts.expected

@@ -0,0 +1,2 @@
+| stmts.kt:2:41:4:1 | { ... } |
+| stmts.kt:3:5:3:16 | return ... |

java/ql/test/kotlin/library-tests/stmts/stmts.kt

@@ -0,0 +1,5 @@
+
+fun topLevelMethod(x: Int, y: Int): Int {
+    return x + y
+}
+

java/ql/test/kotlin/library-tests/stmts/stmts.ql

@@ -0,0 +1,5 @@
+import java
+
+from Stmt s
+select s
+