extend weather block to show sunset and sunrise

[sMailund]

ref #715

Opted to include into existing weather block instead of creating standalone block.
Implemented for both OpenWeatherMap and MetNo providers

[bim9262]

I did a little POC to get the date based on the lat/long so that we can pass that to metno.

Add tz-search as a dependency

use chrono::Utc;
use chrono_tz::Tz;

fn main() {
    let (lat, long) = (30., -97.);
    let tz: Tz = tz_search::lookup(lat, long).unwrap().parse().unwrap();
    let date = Utc::now().with_timezone(&tz).format("%Y-%m-%d");
    println!("{}", date);
}

Obviously we'd want to swap out those unwraps for error("")?s

[bim9262]

@sMailund would you like to continue work on this? If not I can take it over.

[sMailund]

@bim9262 been meaning to get back to this for a while, but not able to get the time for it! Feel free to take over if you want to!

[bim9262]

@sMailund, I squashed your commits, and rebased them onto master + added one new commit to add the sunset to the nws provider + rearrange a bit for the rebase. Feel free to check it out/test