PSI Unifier: Use convention-based call for array access expressions when comparing elements by resolved calls

#KT-8312 Fixed

idea/testData/refactoring/introduceVariable/ComplexCallee.kt

@@ -0,0 +1,7 @@
+// WITH_RUNTIME
+
+fun fn(index : Int, list: List<()->Unit>) {
+    when  {
+        index in list.indices -> <selection>list[index]</selection>()
+    }
+}

idea/testData/refactoring/introduceVariable/ComplexCallee.kt.after

@@ -0,0 +1,10 @@
+// WITH_RUNTIME
+
+fun fn(index : Int, list: List<()->Unit>) {
+    when  {
+        index in list.indices -> {
+            val function = list[index]
+            function()
+        }
+    }
+}

idea/testData/unifier/equivalence/expressions/calls/callAndCalleeRuntime.kt

@@ -0,0 +1,6 @@
+fun test(index: Int, array: Array<() -> Unit>) {
+    val a = <selection>array[index]</selection>()
+    val b = array[index]
+    val c = array.get(index)
+    val d = array.get(index).invoke()
+}

idea/testData/unifier/equivalence/expressions/calls/callAndCalleeRuntime.kt.match

@@ -0,0 +1,7 @@
+array[index]
+
+array[index]
+
+array.get(index)
+
+array.get(index)