[BZ 1042828] - CallTimeDataManager manager should be able to expose raw data, not just the aggregates

Raw data are now exposed via findCallTimeDataRawForResource. We don't return
RAW data (meaning per-request entities), because RHQ server does not store
it. Instead it stores already aggregated data - aggregation per
callDestination happens on agent when sending metric report. At maximum (as
minimum collection interval is 1m) user can get aggregated data for requests
within 1 minute per callDestination). This data are considered as RAW
because it's rawest we have.