floodsub.go
func NewFloodSub(ctx context.Context, h host.Host, opts ...Option) (*PubSub, error) {
	return NewFloodsubWithProtocols(ctx, h, []protocol.ID{FloodSubID}, opts...)
}
func NewFloodSub(ctx context.Context, h host.Host, opts ...Option) (*PubSub, error) {
	return NewFloodsubWithProtocols(ctx, h, []protocol.ID{FloodSubID}, opts...)
}
// NewFloodSub returns a new PubSub object using the FloodSubRouter.