refactor: Move PHP settings checker into a class #1078

Job	Run time
AutoReview Tests	22s
Lint CS	26s
Unit Tests (PHP 8.2, locked)	48s
Unit Tests (PHP 8.2, lowest)	17s
Wait for the PHAR & Docker images	5m 35s
Unit Tests (PHP 8.2, highest)	32s
Unit Tests (PHP 8.3, highest, --ignore-platform-req=php+)	1m 6s
Update the RequirementChecker	0s
End-to-End Tests (_test_e2e_pass_no_config_min_composer_php, ghcr.io/box-project/box_php725)	26s
End-to-End Tests (_test_e2e_pass_no_config_min_box_php, ghcr.io/box-project/box_php82)	24s
End-to-End Tests (_test_e2e_pass_complete_min_composer_php, ghcr.io/box-project/box_php725)	29s
End-to-End Tests (_test_e2e_pass_complete_min_box_php, ghcr.io/box-project/box_php82)	19s
End-to-End Tests (_test_e2e_fail_complete_min_composer_php, ghcr.io/box-project/box_php725)	24s
End-to-End Tests (_test_e2e_fail_complete_min_box_php, ghcr.io/box-project/box_php82)	45s
End-to-End Tests (_test_e2e_skip_min_composer_php, ghcr.io/box-project/box_php725)	13s
End-to-End Tests (_test_e2e_pass_complete_requirement_checker_not_disabled, ghcr.io/box-project/b...	1m 13s
End-to-End Tests (_test_e2e_fail_conflict, ghcr.io/box-project/box_php82)	21s
RequirementChecker status	1s
	13m 41s

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