chore: Add webhookUrl to Message model, DTOs, and services

Adds webhookUrl field to Message model, SendMessageDto, SendTemplateDto, SendContactDto, and related services to enable sending messages to a specified webhook URL. This change allows for more flexible message handling and delivery options.

Modified files:
- prisma/postgresql-schema.prisma
- src/api/dto/sendMessage.dto.ts
- src/api/services/channels/whatsapp.business.service.ts
- src/validate/message.schema.ts

Untracked files:
- prisma/migrations/20240723200254_add_webhookurl_on_message/

src/validate/message.schema.ts

@@ -33,6 +33,7 @@ export const templateMessageSchema: JSONSchema7 = {
     name: { type: 'string' },
     language: { type: 'string' },
     components: { type: 'array' },
+    webhookUrl: { type: 'string' },
   },
   required: ['name', 'language'],
 };