⚠️ !Breaking Change! Reorder constructor parameters, remove $userAgent

[pavog]

The constructor of HangarAPIClient now takes the API key first, followed by the configuration and the HTTP client. This matches the other API clients (for Modrinth and CurseForge):

// before
$client = new HangarAPIClient(null, "api-key");

// after
$client = new HangarAPIClient("api-key");

Breaking changes

• The parameters are now ordered $apiKey, $configuration, $httpClient. Calls that pass the configuration or the API key by position have to be updated. Calls with named arguments keep working, except for userAgent.
• The $userAgent parameter is removed. Use setUserAgent() instead, or set the user agent on a configuration and pass it to the constructor.

Tests and README

• The test helper passes the API key and the configuration to the constructor by position.
• The test for the $userAgent parameter is replaced by a test that checks that the host and user agent of a configuration passed to the constructor are used.
• A new test checks that an API key passed to the constructor is exchanged for a JWT, which is then sent with the next request.
• The README shows how to pass the API key to the constructor and how to set the user agent on your own configuration.