…ormational status codes (nicolas-grekas)This PR was merged into the 4.3 branch.Discussion----------[HttpClient] fix support for 103 Early Hints and other informational status codes| Q             | A| ------------- | ---| Branch?       | 4.3| Bug fix?      | yes| New feature?  | no| BC breaks?    | no| Deprecations? | no| Tests pass?   | yes| Fixed tickets | -| License       | MIT| Doc PR        | -I learned quite recently how 1xx status codes work in HTTP 1.1 when I discovered the [103 Early Hint](https://evertpot.com/http/103-early-hints) status code from [RFC8297](https://tools.ietf.org/html/rfc8297)This PR fixes support for them by adding a new `getInformationalStatus()` method on `ChunkInterface`. This means that you can now know about 1xx status code by using the `$client->stream()` method:```php$response = $client->request('GET', '...');foreach ($client->stream($response) as $chunk) {    [$code, $headers] = $chunk->getInformationalStatus();    if (103 === $code) {        // $headers['link'] contains the early hints defined in RFC8297    }    // ...}```Commits-------34275bb [HttpClient] fix support for 103 Early Hints and other informational status codes