OpenAPI Webhook Support

Speakeasy has enhanced its SDK generator by adding support for OpenAPI webhook definitions, ensuring webhooks are treated with the same importance as other API endpoints and improving the Developer Experience. This update allows Speakeasy to generate types for webhook request and response objects, promoting a consistent user interface for API interactions. Additionally, Speakeasy has introduced small improvements, such as support for any router based on http.ServeMux to facilitate request and response logging and a "does not contain" filter in the request viewer for better log filtering. These enhancements aim to streamline the integration and management of webhooks in API strategies.