Impl Example trait for NewType in poem-openapi

[ZodiacWind]

Description of the feature

I would like to use NewType such as

#[derive(NewType)]
pub struct MyString(String)

And I also want to generate example for it in my OpenAPI docs, is it possible to do that?

Code example (if possible)

#[derive(NewType)]
#[oai(exmpale)]
pub struct MyString(String)

impl Example for MyString {

    fn example() -> Self {
        Self("abc".to_string())
    }
}

[sunli829]

Added in master branch 🙂

[ZodiacWind]

Added in master branch 🙂

Thanks, good job!