Add more tests in uncommonCases folder

1) dataClass.kt - test with data class
2) receiver.kt - test with Int extension receiver
3) delegation.kt - test with implementation by delegation

compiler/visualizer/testData/uncommonCases/testFiles/receiver.kt

@@ -0,0 +1,12 @@
+fun Int.addOne(): Int {
+    return this + 1
+}
+
+val Int.repeat: Int
+    get() = this
+
+fun main() {
+    val i = 2
+    i.addOne()
+    val p = i.repeat * 2
+}