feat: adds configurable batching support

[Soundarya03]

changes enabling batching settings in publisher config element

[Soundarya03]

#9 addresses this issue

[Soundarya03]

Hi @rollno748 , any feedback on this?

[rollno748]

Hi @Soundarya03,

Apologies for the delay. It's been quite a long time working on this repo.
I see the current changes wont impact the existing functionalities
May i ask you, can you bump the plugin version and gcp pubsub lib and its dependent version to latest - so that, it will be easy for me to merge it to master and publish it to plugins manager

Thanks

[Soundarya03]

Hi @rollno748 , I've made the changes. The google-cloud-pubsub dep I've updated to 1.132.4, and not the latest (1.135.0), because of an opentelemetry dependency it brings in starting 1.133. I thought that might be a change for later, as it might require some more analysis. https://github.com/googleapis/java-pubsub/blob/main/CHANGELOG.md

Hope this is fine for now

[rollno748]

LGTM