migrate to RLNv2: update contract abstraction

[danisharora099]

Description

The js-rln library currently interacts with RLN v1 contracts. With the completion of the RLN v2 contract abstraction, we need to update js-rln to be compatible with the new contract architecture.

This update will:

• Ensure js-rln supports membership management functions as per RLN v2.
• Update the contract interactions to reflect new membership states (Active, GracePeriod, Expired, etc.).
• Align rate-limiting logic with RLN v2's dynamic rate allocation.
• Improve contract upgradability support (e.g., parameter modifications by the owner).
• Introduce support for meta-transactions where applicable.

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User Story

• As a developer, I want js-rln to be compatible with RLN v2 so that I can integrate it seamlessly with dApps that use the latest contract version.
• As a Waku node operator, I want the RLN proof verification process in js-rln to align with the updated rate-limiting rules in RLN v2.
• As a user of RLN-enabled applications, I want to interact with the RLN v2 contract without issues when registering, extending, or withdrawing memberships.

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Proposed Solution / Feature Design

1. Upgrade Contract Interactions

• Update function calls in js-rln to align with the new RLN v2 contract methods.
• Implement handling for new membership lifecycle states.

2. Adapt Membership Management

• Ensure js-rln correctly registers, extends, and erases memberships based on RLN v2 rules.
• Implement logic to handle expired memberships and rate-limit reuse.

Notes

• resolved by feat(rln-v2): upgrade contract abstraction js-rln#110

[weboko]

@danisharora099 can you, please, specify scope of this task and attach PRs if present

[danisharora099]

@danisharora099 can you, please, specify scope of this task and attach PRs if present

updated