feat: Introduce 'wp_ai_client_cache_group' filter hook to allow customization of the object cache

[baikaresandip]

Trac ticket: https://core.trac.wordpress.org/ticket/65127

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[github-actions]

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[github-actions]

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[github-actions]

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[apermo]

PHPdoc for filters should also follow the usual doc style "(The function/filter/action) Does whatever it does"