[REQ][GO] Allow customization of debug output in generated client

Is your feature request related to a problem? Please describe.

When creating a client with the debug flag enabled, the callApi calls httputil.DumpRequestOut. However, there is currently no mechanism to override or customize the way the debug output is handled. This limitation can be problematic if there is a need to hide sensitive information, such as tokens from HTTP headers.

Describe the solution you'd like

• In the configuration file, introduce a new field called "RequestDebug" (or any other appropriate name).
• If the "RequestDebug" field is not set, the NewAPIClient function can initialize a default value, which calls httputil.DumpRequestOut for debug output.

Describe alternatives you've considered

Alternatively, instead of relying on the debug flag in the client generated by openapi-generator, it is possible to override the HTTP client in the client code. By hooking into the RoundTrip function, similar to what is done in terraform-plugin-sdk, custom logging can be performed. This approach provides more flexibility and control over the debug output handling.

Start with modules/openapi-generator/src/main/resources/go/client.mustache, especially callApi and NewAPIClient, then read configuration.mustache around the proposed configuration field. Trace how generated Go clients handle the debug flag and verify that the completed change preserves the default httputil.DumpRequestOut behavior while allowing callers to customize or redact debug output.