Apache Pulsar v3 is now EOL — support needs to be added for v4

[aaronmaxlevy]

See https://pulsar.apache.org/contribute/release-policy/

[aaronmaxlevy]

@haorenfsa @LoveEachDay for what it's worth, I understand that the desire going forward is to move towards Woodpecker.

That said, the current default MQ in the Milvus Helm Chart for clustered deployments is still Pulsar, and there are still a lot of deployments out there using Pulsar that would benefit from the option of staying on Pulsar (by upgrading to Pulsar v4) rather than having to immediately migrate to Woodpecker in order to patch vulnerabilities in their current cluster from running an EOL version of Pulsar.