fetch list of collectors from source of truth

[digizeph]

Source of truth:

• RIPE RIS: https://stat.ripe.net/data/rrc-info/data.json
• RouteViews: https://api.routeviews.org/collector/?format=json

[digizeph]

Created a new cratebgpkit-commons to gather such information.
https://crates.io/crates/bgpkit-commons

See the documentation and the following example on how to use it:

use bgpkit_commons::collectors::get_routeviews_collectors;
fn main() {
    println!("get route views collectors");
    let mut routeviews_collectors = get_routeviews_collectors().unwrap();
    routeviews_collectors.sort();
    let earliest = routeviews_collectors.first().unwrap();
    let latest = routeviews_collectors.last().unwrap();
    println!("\t total of {} collectors", routeviews_collectors.len());
    println!(
        "\t earliest collector: {} (activated on {})",
        earliest.name, earliest.activated_on
    );
    println!(
        "\t latest collector: {} (activated on {})",
        latest.name, latest.activated_on
    );
}