Add --curl-debug option for verbose HTTP debugging

This commit adds a new global --curl-debug CLI option that enables
verbose cURL output to help troubleshoot TLS and connection issues.

When --curl-debug is specified, detailed HTTP transaction information
is displayed including:
- Connection establishment details
- TLS handshake information
- HTTP headers and progress
- Transfer details

This is particularly useful for diagnosing customer issues related to:
- Misconfigured CA certificates
- Incorrect system clocks causing TLS validation failures
- Network connectivity problems
- Certificate verification errors

The implementation leverages Guzzle's built-in debug functionality
which uses cURL's CURLOPT_VERBOSE option under the hood.

Author: namespacebrian

src/Request/Request.php

@@ -155,6 +155,14 @@ private function getClient($base_uri = null): ClientInterface
                     'handler' => $stack,
                 ];
 
+            // Enable cURL debug output if --curl-debug option is set
+            if ($this->getContainer()->has('input')) {
+                $input = $this->getContainer()->get('input');
+                if ($input->hasOption('curl-debug') && $input->getOption('curl-debug')) {
+                    $params['debug'] = true;
+                }
+            }
+
             $host_cert = $config->get('host_cert');
             if ($host_cert !== null) {
                 $params[RequestOptions::CERT] = $host_cert;

src/Terminus.php

@@ -178,6 +178,9 @@ private function addDefaultArgumentsAndOptions(Application $app)
         $app->getDefinition()->addOption(
             new InputOption('--yes', '-y', InputOption::VALUE_NONE, 'Answer all confirmations with "yes"')
         );
+        $app->getDefinition()->addOption(
+            new InputOption('--curl-debug', null, InputOption::VALUE_NONE, 'Enable verbose cURL debug output for troubleshooting TLS and connection issues')
+        );
     }
 
     /**