OpenAPI macro It may not support the generic parameters.

[andeya]

Describe the bug
"handle < U >" is not a valid identifier.

To Reproduce

#[derive(Debug, Clone)]
pub struct handle<U>(U);

#[salvo::oapi::endpoint]
impl<U> handle<U> {
    async fn handle(&self, _req: &mut Request) -> String {
        String::new()
    }
}

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots

Desktop (please complete the following information):

• OS: Mac
• Browser [e.g. chrome, safari]
• Version 0.73.0

Additional context

1. #[salvo::handler] is ok.
2. pub struct handle(i8) is also ok.