Fast get/set operators search

idea/testData/findUsages/kotlin/conventions/get.log

@@ -0,0 +1,5 @@
+Resolved B(1)[2]
+Searched references to B
+Searched references to B.get(i: Int) in Kotlin files
+Used plain search of B.get(i: Int) in LocalSearchScope:
+    CLASS:B

idea/testData/findUsages/kotlin/conventions/set.log

@@ -0,0 +1,8 @@
+Checked type of a
+Resolved a[2]
+Resolved a[2]
+Searched references to B
+Searched references to a in Kotlin files
+Searched references to parameter a of B.set(i: Int, a: B) in Kotlin files
+Used plain search of B.set(i: Int, a: B) in LocalSearchScope:
+    CLASS:B