[FIX] mail: fix various search-related problems

This commit tries to correctly use messages from the cache instead of all
messages.  This means that we need to correctly add messages to the
domain-specific caches, and correctly invalidate them when necessary.

Also, to avoid increasing the algorithmical complexity of the process,
particular care was made to avoid scanning too many lists.  For example,
the channel caches have now a messages field, instead of message_ids.

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