[Proposal] Ability to pass per entry metadata to bulk publish.

[mapaille]

In https://github.com/dapr/dotnet-sdk/blob/master/src/Dapr.Client/DaprClientGrpc.cs#L214, the entry metadata is always empty which prevents us to set the sessionId when publishing events to a session enabled topic.

An option would be to add an overload which takes a list of entries as parameter.

[halspang]

@mapaille - Are you asking for an override that sets the same metadata per event? Or an override that lets you specify metadata per event?

[mapaille]

@halspang I would like an override that lets me specify metadata per event because each event in a batch can have its own session id.

[mapaille]

@halspang Here is the source code on how to add a service bus message with a session id to a service bus message batch.

https://github.com/Azure/azure-sdk-for-net/blob/c3897ec79c796bcd681dbe3fe525bd1153da8548/sdk/servicebus/Azure.Messaging.ServiceBus/src/Sender/ServiceBusMessageBatch.cs#L110

https://github.com/Azure/azure-sdk-for-net/blob/c3897ec79c796bcd681dbe3fe525bd1153da8548/sdk/servicebus/Azure.Messaging.ServiceBus/src/Primitives/ServiceBusMessage.cs#L256

[halspang]

Makes sense to me, I think this could be a valuable addition.

[mapaille]

@halspang Kafka seems to have similar feature using the key metadata. https://developer.confluent.io/courses/apache-kafka/partitions/