Output date filter from cache log at debug level. Remove unused imports

Other logs not directly useful to user have already been converted
to debug log levels in 1ae4016. Just forgot to convert this log line too

src/khoj/search_filter/date_filter.py

@@ -1,6 +1,5 @@
 # Standard Packages
 import re
-import time
 import logging
 from collections import defaultdict
 from datetime import timedelta, datetime
@@ -67,7 +66,7 @@ class DateFilter(BaseFilter):
         # return results from cache if exists
         cache_key = tuple(query_daterange)
         if cache_key in self.cache:
-            logger.info(f"Return date filter results from cache")
+            logger.debug(f"Return date filter results from cache")
             entries_to_include = self.cache[cache_key]
             return query, entries_to_include
 

src/khoj/search_filter/file_filter.py

@@ -1,7 +1,6 @@
 # Standard Packages
 import re
 import fnmatch
-import time
 import logging
 from collections import defaultdict
 

src/khoj/search_filter/word_filter.py

@@ -1,6 +1,5 @@
 # Standard Packages
 import re
-import time
 import logging
 from collections import defaultdict
 

tests/test_text_search.py

@@ -1,5 +1,4 @@
 # System Packages
-from copy import deepcopy
 from pathlib import Path
 
 # External Packages