store: 'mcached' users can specify a cache ID.

Users of 'mcached' can now specify a cache ID; furthermore, the cache
hit rate is automatically recorded for all the caches accessed with
'mcached'.

* guix/store.scm (%max-store-connection-caches)
(%store-connection-cache-names): New variables.
(recorder-for-cache): New procedure.
(record-cache-lookup!): Add 'cache-id' parameter and rewrite in terms of
'recorder-for-cache'.
(lookup-cached-object): Add 'cache-id' parameter and honor it.
(%mcached): Add #:cache parameter and honor it.
(mcached): Add '=>' keyword and corresponding clauses.

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