[Lambda] Intuitive developer experience for web applications with multi-region support

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**Description**
Developers building HTTP-based serverless applications need a streamlined developer experience for modern web frameworks with streaming support (including server-sent events) and low latency.

This feature enables developers to easily build HTTP-based web applications with native multi-region experience.

No se especifican archivos del repositorio, pruebas ni puntos de entrada. Empieza por aclarar las integraciones previstas con frameworks web, el comportamiento de streaming y server-sent event, los objetivos de latencia y el modelo multirregional. Los criterios de finalización deberían especificar un flujo de trabajo definido para desarrolladores y soporte validado para estos escenarios.

Escrito por el modelo de indexación a partir del texto del issue.