[Enhancement] Validation of subscription names in the Pulsar broker

[alpreu]

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• I searched in the issues and found nothing similar.

Motivation

Currently, for resources like tenants, namespaces, topics the Pulsar broker will do some validation on the naming to ensure a certain format: https://github.com/apache/pulsar/blob/master/pulsar-common/src/main/java/org/apache/pulsar/common/naming/NamedEntity.java

For subscription names however, there is no validation at all, possibly causing issues in downstream systems.

Solution

Introduce a validation for subscription names, similar to what is already done with NamedEntity.

Because this might break things for users currently using such names, it should be optional first so users have time to make the necessary changes.

Alternatives

No response

Anything else?

No response

Are you willing to submit a PR?

• I'm willing to submit a PR!