Add PHPUnit configuration and refactor MessageTrait methods (#1) * Add PHPUnit configuration and refactor MessageTrait methods - Introduced a new PHPUnit configuration file (phpunit.xml) to set up testing environment and coverage settings. - Refactored the MessageTrait by removing the dependency on Laminas\Mime\Decode and implementing a custom splitHeaderField method for header parsing. - Removed outdated tests related to SwooleFileStream and SwooleStream in SwooleStreamTest.php to streamline the test suite. * Add tests for SwooleFileStream and SwooleStream in SwooleStreamTest