Broadcast channel is a non-blocking primitive for communication between the sender and multiple receivers that subscribe for the elements using openSubscription function and unsubscribe using ReceiveChannel.cancel function.
See BroadcastChannel() factory function for the description of available broadcast channel implementations.
Note: This API is obsolete since 1.5.0. It will be deprecated with warning in 1.6.0 and with error in 1.7.0. It is replaced with SharedFlow.