Update environment configuration and refactor OPC activities for async handling

- Expanded the .env file with configurations for MongoDB, Postgres, MlFlow, and Temporal.
- Refactored OPC class methods to be asynchronous, including init_opc, write_data, manage_output_tags, and shutdown.
- Updated the worker to initialize OPC asynchronously and adjusted shutdown handling for activities.

.gitignore

@@ -41,4 +41,6 @@ htmlcov/
 # git keys
 git_key*
 
-git_log
+git_log
+
+.env