Update PhpHttp Transport

[DimmmCom]

Proposal:

The HttpClientDiscovery and MessageFactoryDiscovery classes have been deprecated and Psr18ClientDiscovery and Psr17FactoryDiscovery are recommended.
The current implementation of the PhpHttp class may also contain errors, as not all message factories support passing $headers and $content when creating a request. Specifically, when using "GuzzleHttp\Psr7\HttpFactory," we won't be able to pass these parameters. Here is the code from "GuzzleHttp\Psr7\HttpFactory"

public function createRequest(string $method, $uri): RequestInterface
    {
        return new Request($method, $uri);
    }

I suggest adding additional validation and recording of these parameters when creating a Request. For example:

$message = $this->messageFactory->createRequest($method, $url, $headers, $content);
        if (!$message->hasHeader('Content-Type')) {
            foreach ($headers as $key => $value) {
                $message = $message->withAddedHeader($key, $value);
            }
        }
        if (!empty($content) && empty($message->getBody()->getContents())) {
            $message = $message->withBody($this->messageFactory->createStream($content));
        }

#259

Checklist:

^{To be completed by the assignee. Check off tasks that have been completed or are not applicable.}

• Implementation completed
• Tests developed
• Documentation updated
• Documentation reviewed
• OpenAPI YAML updated and issue created to rebuild clients

[Nick-S-2018]

Done in #259
Also a related test added in c087ee1

[github-actions]

Thanks for the update! However, the internal checklist is not yet complete. A Manticore team member will close this issue once everything is checked off. 🛠️