feat: Support SMS and WhatsApp

### Feature Description

SMS document signing functionality allows users to sign documents using a secure SMS-based authentication process. This feature provides a convenient and efficient way for users to verify their identity and sign important documents without the need for additional hardware or software.

Use Case

A user receives a document that requires their signature. Instead of printing, signing, and scanning the document, the user opts to use the SMS document signing functionality. The user initiates the signing process by entering their mobile phone number and receives a unique code via SMS. After entering the code into the system, the user's identity is verified, and they can proceed to sign the document electronically.

Proposed Solution

The proposed solution for SMS document signing involves integrating a secure SMS authentication system with the document signing platform. When a user requests to sign a document, the system sends a unique code to the user's mobile phone number. The user then enters this code into the system to verify their identity and gain access to the document for signing. Additionally, the system should ensure that the SMS communication is encrypted and secure to protect sensitive information during the signing process.

Alternatives (optional)

No response

Additional Context

No response

Please check the boxes that apply to this feature request.

[ ] I have searched the existing feature requests to make sure this is not a duplicate.
[ ] I have provided a detailed description of the requested feature.
[ ] I have explained the use case or scenario for this feature.
[ ] I have included any relevant technical details or design suggestions.
[ ] I understand that this is a suggestion and that there is no guarantee of implementation.

SergeWilfried / docu