Support for OpenTelemetry for Pubsub messages

[jfbenckhuijsen]

Thanks for stopping by to let us know something could be better!

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Is your feature request related to a problem? Please describe.
I'm looking at solving the OpenTelemtry feature request for the Quarkus Google Cloud extensions (see issue quarkiverse/quarkus-google-cloud-services#451) and wonder if support for OTEL is planned or already being worked on for the Java client library

Describe the solution you'd like
Preferebly I would assume we would like to have OTEL support in Pubsub-java itself, instead of providing this manually from the extension (as than multiple frameworks in the ecosystem can benefit from it, not just Quarkus).

Describe alternatives you've considered
N/A

Additional context
N/A

[michaelpri10]

Hello! We do have plans to add Open Telemetry integration into this library and work on it will be beginning soon.