Add `@namespaced` directive for namespacing by seperation of concerns #2378

Job	Run time
benchmarks (8.2, ^10)	31s
PHPStan on PHP 8.0 with Laravel ^9 and lowest dependencies	1m 6s
PHPUnit on PHP 8.0 with Laravel ^9 and lowest dependencies	1m 3s
PHPStan on PHP 8.0 with Laravel ^9 and highest dependencies	48s
coverage (8.2, ^10)	1m 0s
PHPUnit on PHP 8.0 with Laravel ^9 and highest dependencies	53s
PHPStan on PHP 8.1 with Laravel ^9 and lowest dependencies	51s
PHPUnit on PHP 8.1 with Laravel ^9 and lowest dependencies	1m 13s
PHPStan on PHP 8.1 with Laravel ^9 and highest dependencies	42s
PHPUnit on PHP 8.1 with Laravel ^9 and highest dependencies	1m 2s
PHPStan on PHP 8.1 with Laravel ^10 and lowest dependencies	54s
PHPUnit on PHP 8.1 with Laravel ^10 and lowest dependencies	1m 10s
PHPUnit on PHP 8.1 with Laravel ^10 and highest dependencies	1m 1s
PHPUnit on PHP 8.2 with Laravel ^9 and lowest dependencies	1m 10s
PHPUnit on PHP 8.2 with Laravel ^9 and highest dependencies	1m 1s
PHPStan on PHP 8.1 with Laravel ^10 and highest dependencies	48s
PHPUnit on PHP 8.2 with Laravel ^10 and lowest dependencies	1m 9s
PHPStan on PHP 8.2 with Laravel ^9 and lowest dependencies	1m 0s
PHPUnit on PHP 8.2 with Laravel ^10 and highest dependencies	55s
PHPStan on PHP 8.2 with Laravel ^9 and highest dependencies	43s
PHPStan on PHP 8.2 with Laravel ^10 and lowest dependencies	1m 1s
PHPStan on PHP 8.2 with Laravel ^10 and highest dependencies	39s
	20m 40s

Provide feedback