Change Signature: Support implicit calls of 'invoke' and 'get'

Also drop 'operator' keyword when necessary

 #KT-22718 Fixed

idea/testData/refactoring/changeSignature/InvokeConventionReceiverToParameterAfter.kt

@@ -0,0 +1,9 @@
+class A
+
+fun invoke(a: A, s: String, i: Int) {}
+
+fun usage(a: A) {
+    invoke(a, "", 42)
+    invoke(A(), "", 42)
+    invoke(a, "", 42)
+}