Initial Cloudberry code dump2.

[my-ship-it]

closes: #ISSUE

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Change logs

Merge partial CBDB codes on to base code.

Why are the changes needed?

This commit includes several features.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

ICW tests passed

Contributor's Checklist

Here are some reminders before you submit the pull request:

• Document changes
• Communicate in the GitHub Issues or Discussions (list them if needed)
• Add tests for the change
• Pass make installcheck
• Pass make -C src/test installcheck-cbdb-parallel

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

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[github-actions]

Hiiii, @my-ship-it welcome!🎊 Thanks for taking the effort to make our project better! 🙌 Keep making such awesome contributions!

[tuhaihe]

Thanks for @my-ship-it and your team's great work!

[yjhjstz]

LGTM.