[lua][module] Phoenix module folder re-org

[CriticalXI]

I affirm:

• I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
• I understand I should leave resolving conversations to the LandSandBoat team so that reviewers won't miss what was said.
• I have read and understood the Contributing Guide and the Code of Conduct.
• I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

• Reworks the existing files in the Phoenix lua module folder to follow a similar organization structure to the recently adjusted era/ lua folder.
• Added a beta/ folder for files that should be disabled once open beta is completed.

Steps to test these changes

• None, it's just moving files around