Generate codegen tests on scripts

compiler/testData/codegen/scriptCustom/fib.lang.kt

@@ -0,0 +1,8 @@
+// this script expects parameter num : Int
+
+fun fib(n: Int): Int {
+    val v = if(n < 2) 1 else fib(n-1) + fib(n-2)
+    return v
+}
+
+val result = fib(num)

compiler/testData/codegen/scriptCustom/fibwp.lang.kt

@@ -0,0 +1,11 @@
+package test
+
+// this script expected parameter num : Int
+
+fun fib(n: Int): Int {
+    val v = if(n < 2) 1 else fib(n-1) + fib(n-2)
+    return v
+}
+
+val result: Int = fib(num)
+12

compiler/testData/codegen/scriptCustom/fibwprunner.kts

@@ -0,0 +1,4 @@
+val fibwp = test.Fibwp(5)
+val callResult = fibwp.fib(4)
+val result = fibwp.num  + fibwp.result - 5
+fibwp.rv

compiler/testData/codegen/scriptCustom/methodWithClosure.lang.kt

@@ -0,0 +1,2 @@
+val v = 239
+fun method() = num + v