Migrate from hardhat to foundry

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Foundry is currently regarded as the most advanced tooling for working with smart contracts
https://github.com/foundry-rs/foundry

The main benefit is faster testing which saves developers time. Foundry also has some interesting advanced features for testing like cheat codes.
The difference is that tests are written in solidity as well so code in smart contracts is tested more natively which is beneficial for testing and well as for developers.