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

#KT-8312 Fixed

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)