Refactor db_connector.py to utilize singleton pattern

created a metaclass called "MetaDatabaseConnector" for the "DatabaseConnector" class in order to implement a singleton pattern.

this will aid with database integrity

scraping/DatabaseConnector/db_connector.py

@@ -2,7 +2,16 @@
 import json
 
 
-class DatabaseConnector:
+class MetaDatabaseConnector(type):
+    _instances = {}
+
+    def __call__(cls, *args, **kwargs):
+        if cls not in cls._instances:
+            cls._instances[cls] = super(MetaDatabaseConnector, cls).__call__(*args, **kwargs)
+        return cls._instances[cls]
+
+
+class DatabaseConnector(metaclass=MetaDatabaseConnector):
     def __init__(self, config_path="./"):
         self.mysql = None
         self.config_path = config_path