Fix linter & better organize foundry dependencies

[MattPereira]

Closes #42

Summary

• Added the Lint workflow back to ensure dependencies and type safety
• Moved the v3-monorepo dependencies out of the root package.json into the foundry/package.json, which fixed the local contract import complaints shown in Fix Dependencies and Linter #42
• Shoveled the HelperFunctions into HelperConfig to simplify script inheritance
• Changed Permit2 dependency to be a git submodule in the foundry/lib folder because of issues with checksum in yarn.lock on different machines. I think this will be more reliable