Add support for OMNI Failover endpoints

[komdil]

Add support for OMNI Failover endpoints:
https://www.infobip.com/docs/api/channels/omni-failover

[ib-tjuhasz]

Hi @komdil

Thank you for your suggestion regarding OMNI Failover endpoint support.

Currently, we do not have plans to directly implement the OMNI Failover endpoints. However, we are actively working on integrating the Messages API (https://www.infobip.com/docs/api/platform/messages-api) into our SDK.

We believe the Messages API offers a more comprehensive and feature-rich approach to managing communications, and it will be our primary focus for future development and support.

We appreciate your understanding and will keep you updated on the Messages API integration progress.

Best regards,
Tamás Juhász