Add a new abstract scalar `IntRange` #12

Job	Run time
Static Code Analysis	17s
Test for PHP 8.0 (prefer-lowest)	17s
Test for PHP 8.0 (prefer-stable)	17s
Code Coverage	21s
Validate composer dependencies	15s
Test for PHP 8.1 (prefer-lowest)	14s
Test for PHP 8.1 (prefer-stable)	14s
Test for PHP 8.2 (prefer-lowest)	11s
Test for PHP 8.2 (prefer-stable)	16s
	2m 22s

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