[broker] Enable users to set subscription expiration time for each namespace #6851
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Motivation
We can automatically delete inactive subscriptions by setting
subscriptionExpirationTimeMinutes
in broker.conf to a value greater than 0.However, since this setting value applies to all topics, we have to set it to 0 if there is even one topic whose subscriptions should not be deleted.
Modifications
Enable users to set a subscription expiration time for each namespace. This value overrides
subscriptionExpirationTimeMinutes
in broker.conf.