[TASK] Implement `(At)RuleSet::getArrayRepresentation()` #4598

Job	Run time
PHP Lint (7.4)	36s
PHP Lint (8.2)	33s
PHP Lint (8.1)	20s
PHP Lint (8.0)	30s
PHP Lint (7.3)	35s
PHP Lint (8.4)	26s
PHP Lint (8.3)	20s
PHP Lint (8.5)	30s
PHP Lint (7.2)	1m 51s
Static Analysis (php:stan, 8.3)	46s
Static Analysis (php:cs-fixer, 8.3)	40s
Static Analysis (php:rector, 8.3)	50s
Static Analysis (composer:normalize, 8.3)	47s
Static Analysis (php:sniff, 8.3)	43s
Unit tests (8.1)	37s
Unit tests (7.3)	49s
Unit tests (8.5)	18s
Unit tests (8.0)	34s
Unit tests (8.3)	37s
Unit tests (8.2)	43s
Unit tests (7.2)	36s
Unit tests (7.4)	31s
Unit tests (8.4)	27s
	14m 39s

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