fix: Return page width and height from document (#700) #619

Job	Run time
PHPUnit (PHP 7.2)	29s
PHPUnit (PHP 7.3)	40s
Tests alternative autoloader (PHP 7.1)	6s
PHPUnit (PHP 7.4)	35s
PHPUnit Composer v2 (PHP 7.4)	34s
Tests alternative autoloader (PHP 7.2)	7s
PHPUnit (PHP 8.0)	29s
Tests alternative autoloader (PHP 7.3)	7s
PHPUnit coverage (PHP 7.4)	1m 6s
PHPUnit (PHP 8.1)	37s
Tests alternative autoloader (PHP 7.4)	6s
PHPUnit (PHP 8.2)	26s
Tests alternative autoloader (PHP 8.0)	8s
Tests alternative autoloader (PHP 8.1)	11s
PHPUnit (PHP 7.1)	29s
PHPUnit (PHP 8.3)	29s
Tests alternative autoloader (PHP 8.2)	10s
PHPUnit lowest deps (PHP 7.3)	27s
Tests alternative autoloader (PHP 8.3)	6s
Windows-Tests with PHP 7.1	1m 8s
Windows-Tests with PHP 7.2	54s
Windows-Tests with PHP 7.3	55s
Windows-Tests with PHP 7.4	53s
Windows-Tests with PHP 8.0	53s
Windows-Tests with PHP 8.1	1m 3s
Windows-Tests with PHP 8.2	1m 9s
Windows-Tests with PHP 8.3	1m 10s
	15m 27s

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