Refactoring: "simplify assert not null" is now an inspection

idea/testData/inspectionsLocal/simplifyAssertNotNull/complicatedMessageLambda.kt

@@ -0,0 +1,7 @@
+// PROBLEM: none
+// WITH_RUNTIME
+
+fun foo(p: Array<String?>) {
+    val v = p[0]
+    <caret>assert(v != null, { val t = 1; "Should be not null: $t" })
+}