Separate test directory for PHP and add factories

[mrabbani]

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• [ ] My code follow the WordPress' coding standards
• [ ] My code satisfies feature requirements
• [ ] My code is tested
• [ ] My code passes the PHPCS tests
• [ ] My code has proper inline documentation
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PR Self Review Checklist:

• Code is not following code style guidelines
• Bad naming: make sure you would understand your code if you read it a few months from now.
• KISS: Keep it simple, Sweetie (not stupid!).
• DRY: Don't Repeat Yourself.
• Code that is not readable: too many nested 'if's are a bad sign.
• Performance issues
• Complicated constructions that need refactoring or comments: code should almost always be self-explanatory.
• Grammar errors.

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As a contributor, your responsibility is to learn from suggestions and iterate your pull request should it be needed based on feedback. Seek to collaborate and produce the best possible contribution to the greater whole.

• [ ] Correct — Does the change do what it’s supposed to? ie: code 100% fulfilling the requirements?
• [ ] Secure — Would a nefarious party find some way to exploit this change? ie: everything is sanitized/escaped appropriately for any SQL or XSS injection possibilities?
• [ ] Readable — Will your future self be able to understand this change months down the road?
• [ ] Elegant — Does the change fit aesthetically within the overall style and architecture?

Summary by CodeRabbit

• New Features

  • Introduced extensive Dokan Factories for creating test data related to entities like Products, Orders, Coupons, and more.
  • Added new Test-Driven Development (TDD) guidelines and documentation.

• Improvements

  • Added comprehensive PHPUnit scripts for running tests.
  • Updated phpunit.xml to enhance test configuration paths.

• Bug Fixes

  • Enhanced test classes and helper methods for better unit test coverage and accuracy.

• Documentation

  • Detailed documentation on Dokan Factories and TDD practices.