Refactor global DEBUG_ENABLED to module-based configuration #220
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Description
This PR refactors the handling of the DEBUG_ENABLED flag in the RSpec::OpenAPI project. Previously managed as a global variable, this refactor introduces a more encapsulated and controlled approach.
Motivation
The motivation behind this change is to improve code quality by increasing modularity and reducing global state.
Changes
Introduction of Config Class: Created a Config class within the RSpec::OpenAPI module to manage configuration settings, including the DEBUG_ENABLED flag.
Module-based Configuration Access: Shifted the access of the debug configuration to be through RSpec::OpenAPI::Config.debug_enabled, making its use more explicit and restricted to the module's context.
Environment Settings Loader: Added load_environment_settings method to the Config class to initialize configuration based on environment variables. This method is called conditionally when the OPENAPI environment variable is set.