Add quick-fix "Replace with safe call & elvis" #KT-17815 Fixed

idea/testData/quickfix/replaceWithSafeCallForScopeFunction/assignment.kt

@@ -0,0 +1,9 @@
+// "Replace scope function with safe (?.) call" "true"
+// WITH_RUNTIME
+var i = 0
+
+fun foo(a: String?) {
+    i = a.run {
+        length<caret>
+    }
+}