Rework logging (#3358)

Unified all log files into one.

### What problem does this PR solve?

Unified all log files into one.

### Type of change

- [x] Refactoring

rag/app/laws.py

@@ -21,7 +21,7 @@ from rag.nlp import bullets_category, remove_contents_table, hierarchical_merge,
     make_colon_as_title, tokenize_chunks, docx_question_level
 from rag.nlp import rag_tokenizer
 from deepdoc.parser import PdfParser, DocxParser, PlainParser, HtmlParser
-from rag.settings import cron_logger
+from api.utils.log_utils import logger
 
 
 class Docx(DocxParser):
@@ -122,8 +122,8 @@ class Pdf(PdfParser):
         start = timer()
         self._layouts_rec(zoomin)
         callback(0.67, "Layout analysis finished")
-        cron_logger.info("layouts:".format(
-            (timer() - start) / (self.total_page + 0.1)))
+        logger.info("layouts:".format(
+            ))
         self._naive_vertical_merge()
 
         callback(0.8, "Text extraction finished")