Add data_loc method to Rust bindings

[ryym]

I am using the Rust ruby-prism crate and would like to access the content after __END__ , but it seems there is currently no way to do so in Rust. Therefore, I would like to add a data_loc method to the Rust bindings. Is it OK?
I think probably we just need to add the method to rust/ruby-prism/src/lib.rs . If my understanding is correct, I will submit a pull request.

pub fn data_loc(&self) -> Option<Location<'_>> {
    let location = unsafe { &(*self.parser.as_ptr()).data_loc };
    ...
}

[kddnewton]

Yes! That would be fine (sorry I didn't respond until now).

[kddnewton]

Do you want to open a PR or should I?

[ryym]

Thank you for your response!
Then I will send a pull request soon.

[ryym]

PR: #2854