Introduce inspection detecting self-assignment of properties

So #KT-20714 Fixed

idea/testData/inspectionsLocal/selfAssignment/sameThis.kt

@@ -0,0 +1,13 @@
+// PROBLEM: Variable 'foo' is assigned to itself
+// WITH_RUNTIME
+// FIX: Remove self assignment
+
+class Test {
+    var foo = 1
+
+    fun test() {
+        with (Test()) {
+            this.foo = <caret>foo
+        }
+    }
+}