Add MHQDialogImmersive for immersive dialog functionality

Introduced a new class, MHQDialogImmersive, to provide an immersive dialog interface with support for customizable speakers, messages, and buttons. This new dialog is designed to improve user interaction and flexibility by allowing detailed configurations like speaker roles, images, and out-of-character messages. The implementation includes dynamic panel scaling and resource localization to ensure seamless integration into the UI.