Optimize caching for alloptions handling.

[pbearne]

Integrate wp_load_alloptions() into the cache initialization process to preload options. Handle 'alloptions' as a special case in wp_cache_add to ensure efficient caching and retrieval. This change minimizes redundant database queries for option retrieval, improving performance.

Trac ticket: https://core.trac.wordpress.org/ticket/32452

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