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/arrayAccessMultipleIndex.kt

@@ -0,0 +1,7 @@
+class Bar {
+    fun get(vararg args: Int) {}
+}
+
+fun foo(a: Bar, i: Int) {
+    a<caret>[i, 1]
+}