Eliminating image hosting for WA & RCS carousals

Feature Request:
Eliminate the need for external image hosting in WhatsApp and RCS carousels by enabling direct image uploads within the respective editors.

Use Case:
Currently, when setting up carousel messages for WhatsApp and RCS, clients are required to host images externally and provide URLs for each image. In practice, this often involves uploading images via the Email Editor to generate a hosted URL, which is then manually copied into the WhatsApp or RCS editor. This multi-step process is time-consuming and fragmented setup process.