Enable the backend to be started through the frontend

[timoKroecker]

User story

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So far the connector can only be started through the command line.
For better UX it should be possible to start the connectors through the frontend.

Acceptance Criteria

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All following points are realized within the home-dashboard:

• If the connector is not running, there should be an active and working button "Run" to start the connector.
• If the connector is running, there should be an active and working button "Stop" to stop the connector.
• If the connector is not running, the button "Stop" should be inactive or hidden.
• If the connector is running, the button "Run" should be inactive or hidden.

DoD General Criteria

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• Feature has been merged into the main branch
• Feature has been added to the documentation
• Product owner approved features
• Developers agreed to release