Feature Request: Add DTLS Service Mesh Support

[UltraInstinct14]

Is your feature request related to a problem? Please describe.
Add support for a DTLS (Datagram Transport Layer Security) service mesh to enhance secure communication over UDP-based protocols in the LoxiLB ecosystem. This feature would provide encryption, integrity, and authentication for UDP traffic, similar to how TLS functions for TCP.

Motivation:

• Secure UDP Traffic: Applications increasingly rely on UDP for high-performance, real-time communication (e.g., VoIP, streaming, gaming). Securing these communications is critical.
• Expanding Capabilities: Offering DTLS support will broaden LoxiLB's applicability in environments where secure datagram communication is a necessity.
• Complement Existing Features: Integrating DTLS fits well alongside existing LoxiLB service mesh capabilities, enabling a unified approach to both TCP and UDP traffic security.

Use Cases

• Secure communication for real-time media streaming applications.
• Securing control plane traffic in IoT networks or edge computing environments.
• Enabling secure service-to-service communication for UDP-based protocols like QUIC.

Describe the solution you'd like

Proposed Solution

1. DTLS Library Integration: Evaluate open-source DTLS libraries such as mbedTLS or OpenSSL.
2. Policy Configuration: Extend existing policy definitions to allow specifying DTLS options for services.
3. Session Management: Handle DTLS session establishment and re-establishment seamlessly within the service mesh.
4. Key Management: Integrate with existing secrets management solutions for certificate and key distribution.
5. Observability: Add monitoring and metrics specific to DTLS traffic (e.g., session stats, handshake performance).

Describe alternatives you've considered
N/A

Additional context
N/A