feat: update sample to use beam-side lite io

[anguillanneuf]

Pub/Sub Lite maintains two I/O connectors to Beam.

This PR updates the original sample to use the Beam-side PubsubLiteIO.

Wait to merge this PR after getting approvals from the Pub/Sub Lite team.

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Chatted with @manuelmenzella-google, let's wait to merge it after the Beam-side I/O is stable.

[anguillanneuf]

Is it possible to add https://github.com/orgs/googleapis/teams/api-pubsublite as a reviewer here?

[lesv]

@api-pubsublite PLEASE REVEIW

[lesv]

@anguillanneuf I can't invite teams from another org, we can try to create a replicate team in this org, however. Could you invite an individual to review this? If you can't add them directly, you can mention them in a comment.

[anguillanneuf]

@lesv A replicate team for https://github.com/orgs/googleapis/teams/api-pubsublite is the best.

I chatted with @manuelmenzella-google, we decided to punt on it until the I/O connector released with Beam is stable, which could be another month or two.

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Update: Once https://github.com/orgs/googlecloudplatform/teams/api-pubsub-and-pubsublite is ready. We can add it as a reviewer.

[lesv]

@anguillanneuf Looks like there needs to be some manual work at this point.

[lesv]

@anguillanneuf What's the plan for this? Will it ever be merged or should we close it?

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