[issue #788] Add more nullity annotations where relevant

(chainable setters, static constructors, builder stuff)

test/transform/resource/after-delombok/StaticConstructor.java

@@ -0,0 +1,12 @@
+public class StaticConstructor {
+	String name;
+	@java.lang.SuppressWarnings("all")
+	private StaticConstructor(final String name) {
+		this.name = name;
+	}
+	@org.checkerframework.checker.nullness.qual.NonNull
+	@java.lang.SuppressWarnings("all")
+	public static StaticConstructor of(final String name) {
+		return new StaticConstructor(name);
+	}
+}