Added ability to run without ext. services

[uglrl]

Make sure, you have done de following before merging this pull request:

• [x] Your code is documented using doc comments.
• [x] You added appropriate logging in your code.
• [x] You added unit tests to all your implemented functions.
• [x] You ran cargo format and cargo clippy to format your code and check for improvements.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.72%. Comparing base (fe9c32b) to head (2b74329). Report is 11 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #151 +/- ## ======================================= Coverage 92.72% 92.72% ======================================= Files 41 41 Lines 1746 1746 ======================================= Hits 1619 1619 Misses 127 127 ```

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[uglrl]

I thought about doing that, but decided against it, since it would make the normal code flow more difficult to read and understand.