feat: Add support for Arbitrum Mainnet

[gfournieriExec]

No description provided.

[Copilot]

Pull Request Overview

This PR adds support for Arbitrum One mainnet deployment to the project's configuration. The changes enable the project to deploy and verify contracts on Arbitrum's mainnet network alongside the existing testnet support.

• Adds Arbitrum One (chain ID 42161) network configuration to Hardhat
• Includes mainnet-specific configuration with gas settings and contract addresses
• Updates changelog to document the new mainnet support

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
hardhat.config.ts	Adds Arbitrum One network configuration with RPC endpoints, gas settings, and Etherscan API key
config/config.json	Adds Arbitrum One chain configuration with contract addresses and deployment settings
CHANGELOG.md	Documents the addition of Arbitrum One support

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.66%. Comparing base (466cb47) to head (5fafdf9).
⚠️ Report is 28 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #248   +/-   ##
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  Coverage    83.66%   83.66%           
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  Files           38       38           
  Lines         1218     1218           
  Branches       227      227           
========================================
  Hits          1019     1019           
  Misses         199      199           

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[Le-Caignec]

LGTM