Function track_vex_generated 

pub async fn track_vex_generated(
    advisories_count: usize,
    format: &str,
    output_kind: &str,
    api_token: Option<&str>,
    org_slug: Option<&str>,
)

Track a successful vex generation. format is e.g. "openvex-0.2.0"; output_kind describes where the document went ("stdout", "file").