Function resolve_for 

pub async fn resolve_for(
    client: &Client,
    cache: &SchemaCache,
    project: &str,
    changes: &[Change],
    validate: bool,
) -> Result<(ProjectSchema, Vec<Resolved>)>

Resolves changes for issues of project with the cached schema, refetching it once when a name or value is not in the cached copy (it may predate a change in YouTrack).