[pulsar-broker] Add support of default ttl for namespace #3898
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Motivation
We need default ttl for the namespace when pulsar cluster has lower data-storage capacity at bookie and client is trying to retain more data in the system. In such cases, bookie disk gets 100% full which require manual process to bring them up. So, we want broker to apply default ttl if ttl is not configured as part of namespace policies.
set
ttlDurationDefaultInSeconds=0to disable this feature.