Move Rest API to performance module

[AleTorrisi]

This PR works in combination with newfold-labs/wp-module-performance#135 for Performance module.
The goal is delegate everything to that module and remove useless code in the brand plugin.

Proposed changes

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

[cypress]

HostGator Plugin    Run #6030

Run Properties:   Failed #6030  •  80daa8c8eb ℹ️: Merge d3c57a2ab8f53b9ecdd6aedeb7264019c20aefcc into 184383d3d396b41a64e6ceeb1bd0...

Project	HostGator Plugin
Branch Review	support-for-cache-refactoring
Run status	Failed #6030
Run duration	34m 46s
Commit	80daa8c8eb ℹ️: Merge d3c57a2ab8f53b9ecdd6aedeb7264019c20aefcc into 184383d3d396b41a64e6ceeb1bd0...
Committer	Alessio Torrisi
View all properties for this run ↗︎

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Test results
Failures	1
Flaky	0
Pending	29
Skipped	0
Passing	313
View all changes introduced in this branch ↗︎

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Tests for review

  vendor/newfold-labs/wp-module-performance/tests/cypress/integration/performance.cy.js • 1 failed test

View Output Video

Test		Artifacts
Performance Page > Clear Cache Button Functions		Test Replay Screenshots Video