Add extra options to SwaggerUIConfig

[ThouCheese]

This pull request adds all documented items from the display category to the fields of the struct SwaggerUIConfig. There are a couple of issues still, namely:

• turning on any of the parameters filter, show_extensions, show_common_extensions does nothing. I don't know if this is me misinterpreting the documentation, if the version of the front end doesn't like these options or if it is something else.
• turning on the parameter max_displayed_tags seems to only alter the spacing of the models (???)

I have also changed the two original fields in SwaggerUIConfig from Option<T> to T, and configured the Default to be the same as the default in the swagger documentation. This means that

let conf = SwaggerUIConfig {
    urls: Some(vec![myroute]),
    url: Some("openapi.json".to_string()),
    ..Default::default()
}

can be replaced by

let conf = SwaggerUIConfig {
    urls: vec![myroute],
    url: "openapi.json".to_string(),
    ..Default::default()
}

which feels like a more convenient public interface. I hope this is a welcome change!

[GREsau]

Thanks for the PR, this looks good!

I believe the filter not working is caused byswagger-api/swagger-ui#4267 - I'm not sure about the others, but as long as they're being set in the config correctly then I'm going to assume everything is working on Okapi's end...

[GREsau]

This is now published to crates.io in rocket_okapi v0.5.0 🙂