Migrate to Foundry or Hardhat v3 + Foundry

[axel-muller]

Reasons:

• Solidity native workflow;
• Faster compilation, tests execution;
• Native solidity testing;
• Wide range of tools to interact with network;

Downsides:

• Migration of core contracts will trigger changes in DAO, dmd-meta and others projects;
• Contracts deployment/interaction using Solidity scripts might be complicated;
• Steeper learning curve.

Submodule-based dependency management might be a better replacement for current DAO -> core contracts repo relations.

Existing unit tests written in typescript/javascript must be kept.