Function gateway_service_target_from_str 

pub fn gateway_service_target_from_str(s: &str) -> Option<GatewayServiceTarget>

Parses a single gatewayClass target: either namespace/name (explicit Service) or namespace/<label-selector> (any entry whose Service part contains =, since Service names never do).

The namespace is the segment before the first /; namespaces cannot contain /, so a label selector’s own / (e.g. app.kubernetes.io/name=x) is preserved. Returns None for empty namespace or empty target.