feat: support custom kafka group id prefix

[xxchan]

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What's changed and what's your intention?

fix #17657
follow up of #16111

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Release note

Add new config group.id.prefix for Kafka source.

See comment on the code for doc.

[tabVersion]

the impl LGTM, is there a request to customize the prefix?

[xxchan]

There were some from time to time. To clean the backlog.

[pjpringlenom]

I raised a similar request for pulsar connector consumer id prefix on slack.

[xxchan]

I raised a similar request for pulsar connector consumer id prefix on slack.

I see @tabVersion is doing it: #18377