feat: allow generated column in cdc table

[st1page]

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What's changed and what's your intention?

close #16024
This PR only solve the cdc table without auto schema mapping. We still need to support #19643

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[StrikeW]

LGTM. better to have some e2e test.

[github-actions]

Hi, there.

📝 Telemetry Reminder:
If you're implementing this feature, please consider adding telemetry metrics to track its usage. This helps us understand how the feature is being used and improve it further.
You can find the function report_event of telemetry reporting in the following files. Feel free to ask questions if you need any guidance!

• src/frontend/src/telemetry.rs
• src/meta/src/telemetry.rs
• src/stream/src/telemetry.rs
• src/storage/compactor/src/telemetry.rs
  Or calling report_event_common (src/common/telemetry_event/src/lib.rs) as if finding it hard to implement.
  ✨ Thank you for your contribution to RisingWave! ✨

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