DBZ-8715 Added message compression and concurrency control

[nathan-smit-1]

Hi there,

Made adjustments to include concurrency and compression to pub/sub:

https://cloud.google.com/pubsub/docs/concurrency-control-messages
https://cloud.google.com/pubsub/docs/compress-messages

Set the default concurrency threads to 1 as I imagine anyone setting concurrency to true has some specific goal in mind and will almost certainly adjust. The compression threshold I set is the default value as per the docs.

[nathan-smit-1]

I'm not sure what this build failure is but I'm seeing it on some of the other pull requests as well

[jpechane]

@nathan-smit-1 Thanks for the PR. I wonder if in both cases do we need the enabled config option. Maybe if we introduce 0 as a special value for number of threads and -1 for compression threshold then we could use them as enabled/disabled flag. This would reduce the total number of config options. WDYT?

[nathan-smit-1]

@nathan-smit-1 Thanks for the PR. I wonder if in both cases do we need the enabled config option. Maybe if we introduce 0 as a special value for number of threads and -1 for compression threshold then we could use them as enabled/disabled flag. This would reduce the total number of config options. WDYT?

@jpechane I think that makes sense. Are you okay with the implementation I just pushed with just the two configs? I also updated documentation on this pull: debezium/debezium#6176

[jpechane]

@nathan-smit-1 Applied, thanks!