Add psi tests with the simplest test data

idea/testData/debugger/sequence/psi/streams/negative/Simple.kt

@@ -0,0 +1,6 @@
+import java.util.stream.Stream
+
+fun main(args: Array<String>) {
+  val a<caret> = 100
+  Stream.of(1, 2, 3).toArray()
+}

idea/testData/debugger/sequence/psi/streams/positive/Simple.kt

@@ -0,0 +1,5 @@
+import java.util.stream.Stream
+
+fun main(args: Array<String>) {
+  Stream.of(1, 2, 3).toAr<caret>ray()
+}

idea/testData/debugger/sequence/psi/streams/positive/streamex/Simple.kt

@@ -0,0 +1,5 @@
+import one.util.streamex.StreamEx
+
+fun main(args: Array<String>) {
+  StreamEx.of(1, 2, 3).to<caret>Array()
+}