Limit StorageNode's caches capacity

[SergeiPavlov]

They were unlimited ConcurrentDictionary
Typical process may have > 1000 StorageNodes and these caches take significant amount of RAM:

[botinko]

IMO not worth exchange static mem to cpu and more allocation in this case. if StorageNode was loaded to cache, it will be used in future with high probability.

[SergeiPavlov]

it will be used in future with high probability.

Caches themselves are Ok. I'm against unlimited caches. That is direct way to memory leaks

Also we always should consider good trading CPU vs RAM.
In our current situation the big consumed RAM is a problem, while CPU usage is low.

[snaumenko-st]

Won't it be better to use LFU implementation instead of LRU?
And also I'm concerned about cleanup of the items. Aren't there any requiring it after removal? E.g. if there are IDisposable items in these caches, we should take care of this explicitly.

[SergeiPavlov]

Replaced by #361

[SergeiPavlov]

And also I'm concerned about cleanup of the items. Aren't there any requiring it after removal? E.g. if there are IDisposable items in these caches, we should take care of this explicitly.

There are no unmanaged values, so no need for disposing