Separate switch for each available channel

[wilbiev]

This change refactors the switch platform to provide independent control for each charging channel available on an EVC-net charging station. Previously, a single switch was shared, using a separate selector to determine which channel it controlled.

The update includes:

• Enhancing the Data Update Coordinator to track status information for all channels simultaneously.
• Updating the entity creation logic to spawn a unique switch for each detected channel.
• Ensuring each switch operates independently based on its specific channel's status and provides feedback accordingly.
• A minor fix to a linting issue in the API client.

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PR created automatically by Jules for task 9336932283382751352 started by @wilbiev

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