Use proxy for token contract

[stubbsta]

Description

Add a proxy contract for TestStableToken.
This will facilitate testing of incremental changes to the TST needed for improved token minting and membership registration workflow.

Checklist

Ensure you completed all of the steps below before submitting your pull request:

• Make TST contract upgradable
• Add deployment script for TST Proxy
• Update tests
• Verify using waku-simulator

[Copilot]

Pull Request Overview

This PR converts the TestStableToken contract from a simple contract to an upgradeable contract using OpenZeppelin's proxy pattern. This change enables iterative testing and deployment of token functionality modifications without requiring address changes across dependent systems.

• Convert TestStableToken to use upgradeable OpenZeppelin contracts (ERC20Upgradeable, OwnableUpgradeable, etc.)
• Add proxy deployment infrastructure with initialization support
• Update all test files to deploy TestStableToken through ERC1967Proxy

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/TestStableToken.sol	Convert to upgradeable contract architecture with UUPS proxy pattern
test/TestStableToken.t.sol	Update tests to deploy token through proxy and adjust test expectations
test/WakuRlnV2.t.sol	Update test setup to use proxy-deployed TestStableToken
script/DeployTokenWithProxy.s.sol	Add deployment script for TestStableToken with proxy
test/README.md	Add comprehensive documentation for TestStableToken usage and deployment
script/Deploy.s.sol	Minor import formatting improvement

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[jm-clius]

@0x-r4bbit would appreciate a review from Vac SC :)

[richard-ramos]

Pretty cool :)