Refactor `Callback` validator #778

Job	Run time
ci / Generate job matrix	7s
ci / QA Checks (Documentation Linting [8.1, locked], ubuntu-latest, laminas/laminas-continuous-integra...	25s
ci / QA Checks (MkDocs Linting [8.1, locked], ubuntu-latest, laminas/laminas-continuous-integration-ac...	20s
ci / QA Checks (README Linting [8.1, locked], ubuntu-latest, laminas/laminas-continuous-integration-ac...	21s
ci / QA Checks (PHPUnit [8.1, locked], ubuntu-latest, laminas/laminas-continuous-integration-action@v1...	36s
ci / QA Checks (PHPUnit [8.1, lowest], ubuntu-latest, laminas/laminas-continuous-integration-action@v1...	38s
ci / QA Checks (PHPUnit [8.1, latest], ubuntu-latest, laminas/laminas-continuous-integration-action@v1...	42s
ci / QA Checks (PHPUnit [8.2, lowest], ubuntu-latest, laminas/laminas-continuous-integration-action@v1...	32s
ci / QA Checks (PHPUnit [8.2, latest], ubuntu-latest, laminas/laminas-continuous-integration-action@v1...	36s
ci / QA Checks (PHPUnit [8.3, lowest], ubuntu-latest, laminas/laminas-continuous-integration-action@v1...	37s
ci / QA Checks (PHPUnit [8.3, latest], ubuntu-latest, laminas/laminas-continuous-integration-action@v1...	33s
ci / QA Checks (PHPCodeSniffer [8.1, locked], ubuntu-latest, laminas/laminas-continuous-integration-ac...	25s
ci / QA Checks (Psalm [8.1, locked], ubuntu-latest, laminas/laminas-continuous-integration-action@v1, ...	32s
ci / QA Checks (Backward Compatibility Check [@default, locked], ubuntu-latest, laminas/laminas-contin...	37s
	7m 1s

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