Transfer ownership to KMS-backed deployer for arbitrumNova, arbitrumSepolia, and sepolia. Update to ethers v6.

[Antlion12]

• Update .gitignore.
• Specify KMS-backed signer as the deployer/owner for TreasureMarketplace on arbitrumNova
• Update package.json w/ KMS-related dependencies
• Update indentation of package.json.
• hardhat.config.ts updates: Add KMS key ID for v1 marketplace. Remove obsolete networks.
• Initial check-in of hardhat-extra extensions to support KMS signer.
• Delete TroveBadges and TroveClaimer arbitrumGoerli deploy scripts because (1) arbitrumGoerli is obsolete and (2) Badges lives in indentity-contracts repo.
• Update unit tests to go with dependency updates.
• Update Sepolia deployment.
• Update Sepolia deployment part 2.
• Fix tests by using getAddress()
• Update mocha types and hardhat-verify. Test deployments/verifications on arbitrumNova and arbitrumSepolia.
• Test deployments on arbitrumNova and arbitrumSepolia.
• Scripts for transferring ownership to the new deployer.
• Modify script tags for arbitrumNova.
• Add verification script for mainnet.