clap_complete: zsh completion doesn't add conflicts for group

[tmccombs]

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Rust Version

rustc 1.62.0 (a8314ef7d 2022-06-27)

Clap Version

3.2.6

Minimal reproducible code

use clap::*;
use clap_complete::{generate, shell};

fn main() {
    let mut app = Command::new("test")
        .group(ArgGroup::new("gr").args(&["a", "b"]).conflicts_with("c"))
        .arg(Arg::new("a").short('a'))
        .arg(Arg::new("b").short('b'))
        .arg(Arg::new("c").short('c'))
        .arg(&c);
    app.build();
        
   generate(shell::Zsh, &mut app, app.get_name(), &mut std::io::stdout());
}

Steps to reproduce the bug with the above code

Run code

Actual Behaviour

The zsh completions generated don't account for the conflict between the group and option c.

Expected Behaviour

The zsh completions should specify that the options in the group conflict with option c.

Additional Context

No response

Debug Output

No response