Add support for campaign order attribution data.

[rawdreeg]

All Submissions:

• Have you followed the Contributing guidelines?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

This PR adds campaign-specific attributes to the order attribution data.

How to test the changes in this Pull Request:

1. Using this branch, generate at least 500 orders
2. Follow the steps to test Woo Analytics Order Attribution reports ( woocommercep2.wordpress.com/2024/12/03/order-attribution-reports-hpos-and-non-hpos-support-internal-call-for-testing#how-do-i-test)
3. Once connected, review the report, filter by Campaigns, and confirm there are campaign data,

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you successfully run tests with your changes locally?

Changelog entry

Add - Support for campaign order attribution data

FOR PR REVIEWER ONLY:

• I have reviewed that everything is sanitized/escaped appropriately for any SQL or XSS injection possibilities. I made sure Linting is not ignored or disabled.

[ibndawood]

Thank you, @rawdreeg, for the feature. Does this mean that every generated order is part of a campaign? If so, I recommend refactoring the code so that about 15% of the generated orders are part of the campaigns. 15% is arbitrary. This would make the generated orders close to reality.

[rawdreeg]

@ibndawood, thanks for your review. I reworked the PR to improve campaign distributions in the order generated. I also improved the data variability. Let me know what you think.

[ibndawood]

Thank you, @rawdreeg, this is neat 👍