[domaintools] Update connector to be "manager_supported"

[Powlinett]

Proposed changes

• automated code changes:
  • add settings.py
  • update connector.py
  • update main.py or __main__.py
  • add unit tests

Related issues

• [composer/catalog] Migrate connector to be connector manager supported - P1 #4857

Checklist

• I consider the submitted work as finished
• I have signed my commits using GPG key.
• I tested the code for its functionality using different use cases
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

The code needs to be reviewed by two people: one must fix any issue, the other one review the final commits.