Fastdotcom service optimization

[erwindouna]

Breaking change

Proposed change

As hinted out by @MartinHjelmare the services can be optimized. This PR covers the refactoring part.

Type of change

• [ ] Dependency upgrade
• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] New integration (thank you!)
• [ ] New feature (which adds functionality to an existing integration)
• [ ] Deprecation (breaking change to happen in the future)
• [ ] Breaking change (fix/feature causing existing functionality to break)
• [x] Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• [x] The code change is tested and works locally.
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• [x] Tests have been added to verify that the new code works.

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[home-assistant[bot]]

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[MartinHjelmare]

There's a merge conflict.

[erwindouna]

Redoing this is in a new PR.