IDEA-179871 Automatically use nullable annotations in constructor generation

java/java-tests/testData/codeInsight/generateConstructor/afterNullableField.java

@@ -0,0 +1,9 @@
+import org.jetbrains.annotations.Nullable;
+
+class C {
+    private @Nullable String s;
+
+    public C(@Nullable String s) {
+        this.s = s;
+    }
+}