Move Rest API to performance module

[AleTorrisi]

Proposed changes

This PR works in combination with this one for Performance module.
The goal is delegate everything to that module and remove useless code in the brand plugin.

Type of Change

Production

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency update
• Refactoring / housekeeping (changes to files not directly related to functionality)

Development

• Tests
• Dependency update
• Environment update / refactoring
• Documentation Update

Video

Checklist

• I have read the CONTRIBUTING doc
• I have viewed my change in a web-browser
• Linting and tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

[circlecube]

Looks good, once that performance module PR is merged and a version is tagged we can update it in this PR to make sure tests are all passing with the removed code. Then we can merge it in!

[AleTorrisi]

thanks @circlecube

[arunshenoy99]

This requires newfold-labs/wp-module-onboarding-data#140 to be merged and released, as it's currently blocking an update to the performance module here.

[arunshenoy99]

Merging this into the performance bump branch, which can actually support it along with all the other module updates that include support for the refactoring. This branch should get tests working