feat: create feature flag table

[mcgarrye]

This PR addresses #(1287)

• [x] Addresses the issue in full
• [ ] Addresses only certain aspects of the issue

Description

Creates new feature flag table with desired fields.

How Can This Be Tested/Reviewed?

Run migrations locally. Open query and insert a record into the table.

Author Checklist:

• [ ] Added QA notes to the issue with applicable URLs
• [ ] Reviewed in a desktop view
• [ ] Reviewed in a mobile view
• [ ] Reviewed considering accessibility
• [ ] Added tests covering the changes
• [ ] Made corresponding changes to the documentation
• [x] Ran yarn generate:client and/or created a migration when required

Review Process:

• Read and understand the issue
• Ensure the author has added QA notes
• Review the code itself from a style point of view
• Pull the changes down locally and test that the acceptance criteria is met
• Either (1) explicitly ask a clarifying question, (2) request changes, or (3) approve the PR, even if there are very small remaining changes, if you don't need to re-review after the updates

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