Introduce inspection detecting self-assignment of properties

So #KT-20714 Fixed

idea/testData/inspectionsLocal/selfAssignment/notSelf.kt

@@ -0,0 +1,12 @@
+// PROBLEM: none
+// WITH_RUNTIME
+
+class Bar(var foo: Int = 1)
+
+class Test(var foo: Int = 2) {
+    fun test() {
+        Bar().apply {
+            this.foo = <caret>this@Test.foo
+        }
+    }
+}