Introduction of API Status sensors

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Introduction of API Status sensors

The default status for the supported APIs is "Unknown".

The following logic applies to provide a status:

        if response_code in [200, 204, 207]:
            status = "Up"
        elif response_code == 401:
            status = "Unauthorized"
        elif response_code == 403:
            status = "Forbidden"
        elif response_code == 429:
            status = "Rate limited"
        elif response_code == 1000:
            status = "Error"
        else:
            status = "Down"

FYI @oliverrahner

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@oliverrahner I think I managed to solve all the edge cases and issues with API status detection. :) Now it's ready for merge.