Introduce inspection detecting self-assignment of properties

So #KT-20714 Fixed

idea/testData/inspectionsLocal/selfAssignment/applyCorrect.kt

@@ -0,0 +1,17 @@
+// PROBLEM: none
+// WITH_RUNTIME
+
+// Minimized from KT-20714 itself
+class ServerUser {
+    var id = ""
+    var city = ""
+
+    fun toClientUser() = ClientUser().apply {
+        id = <caret>this@ServerUser.id
+        city = this@ServerUser.city
+    }
+}
+
+class ClientUser {
+    var id = ""
+}