Refactor: rename rmSpace to remove_redundant_spaces (#10796)

### What problem does this PR solve?

- rename rmSpace to remove_redundant_spaces
- move clean_markdown_block to common module
- add unit tests for remove_redundant_spaces and clean_markdown_block

### Type of change

- [x] Refactoring

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

rag/utils/es_conn.py

@@ -26,12 +26,13 @@ from elasticsearch_dsl import UpdateByQuery, Q, Search, Index
 from elastic_transport import ConnectionTimeout
 from rag import settings
 from rag.settings import TAG_FLD, PAGERANK_FLD
-from rag.utils import singleton, get_float
+from rag.utils import singleton
 from api.utils.file_utils import get_project_base_directory
 from api.utils.common import convert_bytes
 from rag.utils.doc_store_conn import DocStoreConnection, MatchExpr, OrderByExpr, MatchTextExpr, MatchDenseExpr, \
     FusionExpr
 from rag.nlp import is_english, rag_tokenizer
+from common.float_utils import get_float
 
 ATTEMPT_TIME = 2
 
@@ -503,7 +504,7 @@ class ESConnection(DocStoreConnection):
                 if not isinstance(v, str):
                     m[n] = str(m[n])
                 # if n.find("tks") > 0:
-                #     m[n] = rmSpace(m[n])
+                #     m[n] = remove_redundant_spaces(m[n])
 
             if m:
                 res_fields[d["id"]] = m