Implemented Operator To Function intention action.

Converts +a, --a, a * b, a..b, a %= b, a in b, etc. to their function call counterparts.

idea/testData/intentions/operatorToFunction/arrayAssignmentMultipleIndex.kt

@@ -0,0 +1,5 @@
+// ERROR: Unresolved reference: array
+fun foo(b: Int) {
+    var a = array(1, 2, 3, 4, 5)
+    a<caret>[2, 3] = b
+}