add Subscription management apis to service

[rysweet]

What feature would you like to be added?

need to add support for message TypeSubscription { string topic_type = 1; string agent_type = 2; }

message Subscription { oneof subscription { TypeSubscription typeSubscription = 1; } }

message AddSubscriptionRequest { string request_id = 1; Subscription subscription = 2; }

message AddSubscriptionResponse { string request_id = 1; bool success = 2; optional string error = 3; }

Why is this needed?

xlang combat