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

Also drop 'operator' keyword when necessary

 #KT-22718 Fixed

idea/testData/refactoring/changeSignature/InvokeConventionAddParameterBefore.kt

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