Move Rest API to performance module

[AleTorrisi]

Proposed changes

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.

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]

Web Plugin    Run #1241

Run Properties:   Failed #1241  •  392b80df19 ℹ️: Merge 1eb795a89b83a5b3afb219c394d9b4e35739cda0 into 85a6afc3498a5da21b4fbd7298dd...

Project	Web Plugin
Branch Review	support-for-cache-refactoring
Run status	Failed #1241
Run duration	04m 40s
Commit	392b80df19 ℹ️: Merge 1eb795a89b83a5b3afb219c394d9b4e35739cda0 into 85a6afc3498a5da21b4fbd7298dd...
Committer	Alessio Torrisi
View all properties for this run ↗︎

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Test results
Failures	1
Flaky	1
Pending	0
Skipped	0
Passing	61
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		Screenshots Video

  tests/cypress/integration/help.cy.js • 1 flaky test

View Output Video

Test		Artifacts
Help Page > Is Accessible		Test Replay Screenshots Video