Accept @Nullable as annotation in query parameters #57
Description
Describe the feature
Add the annotation @nullable before the @query annotation in order to make it possible to pass a null value as query parameter.
Additional context
Instead of using an Optional as parameter which is not suggested and doesn't follow the best use practices by Java & IntelliJ, add the ability to use @nullable instead.
So instead of having to have the Optional (or manually do it by using ctx.queryParam() which kinda removes the library main features)
Instead I suggest the following implementation
