New feature: Configuration Explorer Endpoint

• Added view configurations endpoint to show all configuration settings in the MinimalApi project. The view is of the resolved configuration so you can see what is overridden by different providers.
• Added filtered of configuration results by keyName, source, and valueType.
• Setting to hide/show sensitive data in configuration.
• Updated add dev endpoints to respect the HideDevEndpointsFromOpenApi setting and what is shown publicly in clients like Scalar and SwashBuckle UI.
• Added unit tests.