External RPCDaemon: to open/close minimum files

[AskAlexSharov]

Here cmd/rpcdaemon/cli/config.go:onNewSnapshot
Now we use there agg.Open - it's not enough. Fully re-open all files - is also too brutal.
Less brutal is agg.OpenList -> closeWhatNotInList but this does "immediate close" - but we need "lazy close" (by last-alive-reader of this file).
We already have logic of "lazy remove" - DomainRoTx.Close() -> filesItem.canDelete. Maybe we also need "lazy close" - maybe even use same atomic (like change atomic to int bitmap).

reply.HistoryFiles - has list of good files (Can use it - but also can ingnore it - maybe OpenFiles -> scanDirtyFiles logic is enough)

• Files which are not useful anymore: must be deleted from _dirtyFiles, but not closed. Need mark them as "ready to close" - and last-alive-reader will close it in AggTx.Close()

UnitTest: after handling onNewSnapshot notification:

• last reader must close file without remove
• old reader must be able to read from it - until it call aggTx.Close

Additional feature:

• if reply.HistoryFiles is empty - don't call agg.Open
• if reply.BlocksFiles is empty - don't call allSnapshots.ReopenList

[AskAlexSharov]

done by #12332