Quick Fixes: Implement 'Add val/var to primary constructor parameter' quick-fix for data classes

#KT-4038 Fixed

idea/testData/quickfix/addValVar/addVal.kt

@@ -0,0 +1,4 @@
+// "Add val/var to parameter 'x'" "true"
+data class Foo(<caret>x: Int, val y: Int) {
+
+}

idea/testData/quickfix/addValVar/addVal.kt.after

@@ -0,0 +1,4 @@
+// "Add val/var to parameter 'x'" "true"
+data class Foo(val<caret> x: Int, val y: Int) {
+
+}