cleaunup src.utils

[ArneBinder]

This PR rearranges the content of src.utils. It now contains the submodules:

• config_utils with execute_pipeline, instantiate_dict_entries, prepare_omegaconf
• logging_utils with close_loggers, get_pylogger, log_hyperparameters
• rich_utils with enforce_tags, print_config_tree
• statistic_utils with collect_statistics
• task_utils with extras, save_file, task_wrapper

Note: All methods are directly importable from src.utils!

Main effects visible from outside:

• src.utils.statistics.generic_collect_statistics becomes src.utils.collect_statistics
• statistic measures from src.utils.statistics are moved to src.document.statistics
• the parameter measure of src.utils.collect_statistics is renamed to metric

In addition, this also does the following changes:

• use conll2003_collect_statistics as dataset in the conll2003 experiment to show the statistics functionality.
• use pytorch_ie.utils.hydra.resolve_target instead of version from the hydra package