issue-1161: not initializing most of the per-filesystem request counters until we actually receive at least 1 request of the type #1711
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Unlike NBS we have a lot of different request types in Filestore. And we report a lot of metrics for each <requestType, fsId> pair which generates a lot of work for the monitoring systems that we use. Most of the filesystems never receive the majority of these request types. In this PR I'm not reporting any per-FS counters except Count and Errors/Fatal for the request types which have never been seen by this FS. It should radically decrease the total number of metrics that we report (we'll get rid of a lot of unnecessarily reported zeroes).
#1161