OSGi - org.eclipse.paho.mqttv5.client does not export sub packages

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- [x] Bug exists Release Version 1.2.5 ( Master Branch)

We are having a new paho mqtt v5 camel component and for our OSGi support then we noticed that the bundle JAR only exports

Export-Package: org.eclipse.paho.mqttv5.client;version="1.2.5"

As we use the memory persistence in the persist sub package then OSGi imports fails.

missing requirement [org.apache.camel.camel-paho-mqtt5/3.8.0.SNAPSHOT] osgi.wiring.package; filter:="(osgi.wiring.package=org.eclipse.paho.mqttv5.client.persist)"]]

I wonder if you can make the bundle JAR export its sub packages - or if they are really not for end users, then mark them as private packages in the bundle JAR manifest, then its more obvious to know.

Inspect how the 1.2.5 bundle JAR builds its OSGi manifest and exports org.eclipse.paho.mqttv5.client. Reproduce the missing org.eclipse.paho.mqttv5.client.persist import in an OSGi setup; done when the intended subpackages are exported or explicitly marked private in the manifest.

Written by the indexing model from the issue text.