[Collectors] Remove unused legacy collector, move experimental collectors to common

Author: daniil-lyakhov

src/nncf/common/quantization/initialization/range.py

@@ -16,9 +16,9 @@
 from nncf.common.initialization.dataloader import NNCFDataLoader
 from nncf.common.quantization.structs import QuantizationScheme
 from nncf.common.quantization.structs import QuantizerGroup
+from nncf.common.tensor_statistics.collectors import AggregationAxes
 from nncf.common.tensor_statistics.collectors import ReductionAxes
 from nncf.config.schemata.defaults import NUM_INIT_SAMPLES
-from nncf.experimental.common.tensor_statistics.collectors import AggregationAxes
 
 
 class RangeInitConfig:

src/nncf/common/tensor_statistics/aggregator.py

@@ -23,11 +23,11 @@
 from nncf.common.logging import nncf_logger
 from nncf.common.logging.track_progress import track
 from nncf.common.tensor_statistics.statistic_point import StatisticPointsContainer
+from nncf.common.tensor_statistics.statistics import TensorStatistic
 from nncf.common.tensor_statistics.statistics_serializer import dump_statistics
 from nncf.common.tensor_statistics.statistics_serializer import load_statistics
 from nncf.common.utils.backend import BackendType
 from nncf.data.dataset import Dataset
-from nncf.experimental.common.tensor_statistics.statistics import TensorStatistic
 from nncf.tensor import Tensor
 
 TensorType = TypeVar("TensorType")