[Deliverable] Implement DoS and Sybil protection protocol for libp2p mix

[jm-clius]

Owner: AnonComms Mix

FURPS:

• F3. The libp2p mixnet is protected against trivial DoS attacks
• F4. The libp2p mixnet is protected against a 50% + 1 Sybil attack
• U2. The libp2p mix protocol with DoS and Sybil protection is integrated in nim-libp2p
• U3. The libp2p mix protocol with DoS and Sybil protection is integrated into Waku Lightpush protocol as reference integration

Checklist:

• Code: link to GitHub issues/PRs/Epic
• Dogfood: link to dogfooding session/artefact
• Docs: links to README.md or other docs

[chaitanyaprem]

Links to PRs

vacp2p/nim-libp2p#2037 - pluggable mix DoS protection in nim-libp2p
https://github.com/logos-co/mix-rln-spam-protection-plugin - MIX Spam protection plugin using RLN
logos-messaging/logos-delivery#3693 - Mix spam protection using RLN integrated in Waku Lightpush protocol as a reference

Test RLN DoS protection locally using simulation