Feat: Address Discovery Contract Integration Test Suite

[pedrosgmagalhaes]

This PR introduces a new test suite for the AddressDiscovery smart contract. The tests ensure the contract's behavior aligns with its intended functionality.

Key changes:

• The AddressDiscovery test suite has been created, covering key interactions and permissions.
• Introduced hardhat and chai for contract deployment, interaction, and assertions.

describe("AddressDiscovery", function () {
    it("should allow an account with ACCESS_ROLE to update address", async function () {...});
    it("should not allow an account without ACCESS_ROLE to update address", async function () {...});
    it("admin can change authority", async function () {...});
    it("non-admin can't change authority", async function () {...});
});

Changes

1. Test Setup: Created a fixture for test setup using loadFixture function from hardhat-network-helpers. The fixture deploys the AddressDiscovery contract and also sets up some accounts for testing.

2. Role Testing: Wrote tests to ensure that the ACCESS_ROLE is respected when updating addresses in the contract.

3. Authority Change Testing: Wrote tests to ensure that only an admin can change the authority of the contract.

4. Helper Methods: Used ethers.js utilities for encoding and hashing data.

Please review these changes and let me know if any further adjustments are needed.