feat : add setup_logging with hierarchical astrai logger

- setup_logging(): attach handler only to astrai logger, not root
- all astrai.* sub-module loggers inherit automatically
- controlled by ASTR_LOG_LEVEL env var (default INFO)
- called in if __name__ == '__main__' of each CLI script

scripts/tools/preprocess.py

@@ -2,6 +2,7 @@
 
 import click
 
+from astrai import setup_logging
 from astrai.config.preprocess_config import PipelineConfig
 from astrai.preprocessing.pipeline import Pipeline
 
@@ -47,4 +48,5 @@ def preprocess_command(inputs, output_dir, pipeline_config, tokenizer_path, batc
 
 
 if __name__ == "__main__":
+    setup_logging()
     preprocess_command()