Use bootstrap cache bin for components

Created a merge request.

I don't fully grok how different cache bins interact with different parts of the request but I trust your judgement here :) thanks!

Thanks for merging.

TLDR: bootstrap (and config + discovery) cache bins use APCu to keep the caches in memory. All other cache bins always do a database/redis/memcache query. Things that are used often (this is used on dynamic page cache hits that need to render placeholders), aren't big and don't have many variations benefit from being put in those cache bins.