[WIP] Update PR description with sorting information

[Copilot]

Coding agent has begun work on Update PR descriptio... and will update this pull request as work progresses.

Original prompt

Update PR description to include sorting info

Pull Request

🤨 Rationale

This pull request refactors the logic for mapping table columns and data in the DataFrameDataSourceV2 class by creating efficient lookup maps for column metadata and indices, which streamlines the process of populating field values from decimated data. Additionally, it introduces sorting logic to prioritize the xColumn when specified, ensuring that the data is organized in a meaningful way for visualization.

👩‍💻 Implementation

• Introduced columnInfoByDisplayName and columnIndexByName maps to efficiently retrieve column metadata and indices, replacing repeated array searches for column information and index lookup.
• Updated the logic for populating field values to use these maps, improving clarity and reducing redundant code.
• Refactored variable assignments to separate decimated table columns and data for better readability.
• Enhanced the sortColumnsByType method to prioritize the xColumn when specified, ensuring that it appears first in the sorted order.

🧪 Testing

N/A - Will be added in the follow-up PRs

✅ Checklist

• This PR has a title that follows the commit message format.

Created from VS Code via the GitHub Pull Request extension.

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