Compatibility with JVM snapshots (OpenJDK's Project CRaC)

[onobc]

Make sure Spring Pulsar is compatible with the Spring wide initiative to add support for Project CRaC which allows JVM snapshots to be taken and then restored for faster startup times, make

We will need to ensure that file handles are closed which are:

• Figure out what this entails for Spring Pulsar
• Is Pulsar client capable of supporting this?
• Ensure that file handles are closed (eg. Database connections)
• If applicable - ensure we update to the new Lifecycle methods proposed in Spring Frameworks support.