Fetch platinum members via API

Documentation: https://docs.google.com/document/d/1CBpaKvV6pndds5SEL4vW7vFoJiVxMRQ-sQKEFABoMcM/edit

Example response:

[
    {
        "name": "Company",
        "logo": "https://my.typo3.org/uploads/organizations/hash/logo.png",
        "backlink": "https://www.company.com",
        "email": "info@company.com",
        "membership": "PLATINUM"
    }
]

API needs a token to access the information. This token should be included via Extension Configuration (to add it on production only)