[Tiered Caching] [Milestone 1] Added took time in QuerySearchResult object

[sgup432]

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We need to determine query cost(in terms of latency) to put it on disk cache or not when item is evicted. As for queries(on shard level) which are already cheap enough, it doesn't make sense to cache it on disk. For that, we need to add this info in shard query result object. This way whenever we are taking a decision to put it to disk cache, we will consider to cache queries with took time > Xms.

Details - #10024
and #10870

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