Manual Backport to branch(3.12) : Add data loader core key and column utils

[inv-jishnu]

Description

Backport to branch(3.12) : Add data loader core key and column utils
Resolved conflicts in CoreError class

Related issues and/or PRs

#2383

Changes made

Resolved conflicts in CoreError class

Checklist

The following is a best-effort checklist. If any items in this checklist are not applicable to this PR or are dependent on other, unmerged PRs, please still mark the checkboxes after you have read and understood each item.

• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation to reflect the changes.
• Any remaining open issues linked to this PR are documented and up-to-date (Jira, GitHub, etc.).
• Tests (unit, integration, etc.) have been added for the changes.
• My changes generate no new warnings.
• Any dependent changes in other PRs have been merged and published.

Additional notes (optional)

NA

Release notes

NA