Update project

[adamgall]

Closes #78

The following items only affect the repository around the contracts, and are harmless (but great for the health of the repository) to complete.

• [x] Node.js version 20.12.2
• [x] Upgrade project to use current Hardhat 2.22.2.
  • [x] Tests now run in 20 seconds instead of 2 mins yay.
• [x] Update all tests from ethers-v5 to ethers-v6.
• [x] Remove a lot of extra configuration tools and files.
• [x] Trim down published NPM code to just a single deployments.json file and the contracts
• [x] Remove a bunch of autogenerated stuff from the repo.

The following items will affect smart contract compilation / logic / behavior. Updates here should be approached cautiously. I actually think we should handle these changes in separate PRs.

• Update @gnosis.pm/zodiac package
• Re-include @gnosis.pm/safe-contracts package (gives error if in package.json at the version it has been at, but doesn't seem needed in there, everything compiles fine)
• Update @openzeppelin/contracts[-upgradeable] package[s]

Some important notes:

• Compiling the smart contracts via npm run compile (npx hardhat compile) still produces the exact same bytecode for all contracts which are currently deployed on all networks.
• The following functionality / features are being removed from the NPM package:
  • TypeChain typing and objects
  • Test files
  • Deployment scripts
• Only Contract addresses and ABIs (per network), and the solidity source code, will remain in the NPM package. However, the format of this data will change.