Add "Redundant 'requireNotNull' or 'checkNotNull' call" inspection

#KT-29113 Fixed

idea/testData/inspectionsLocal/redundantRequireNotNullCall/nullable2.kt

@@ -0,0 +1,11 @@
+// PROBLEM: none
+// WITH_RUNTIME
+class Test {
+    var s: String? = null
+
+    fun test() {
+        if (s != null) {
+            <caret>requireNotNull(s)
+        }
+    }
+}