Support open-zeppelin upgrades validations

[fullkomnun]

Fixes: #65
Fixes: #355

Builds on top of previous efforts

• Overrides solc compile tasks to inject open-zeppelin's validations as part of compilation pipeline
• Avoids adding @openzeppelin/hardhat-upgrades hardhat plugin as a dependency as suggested here and instead copies-over minimal amount of glue code
• Adds a dependency on @openzeppelin/upgrades-core and @types/proper-lockfile (used to lock cache file while writing validations)
• Does not rely on open-zeppelin's ".openzeppelin" manifest files and instead uses hardhat-deploy APIs and deployment files as suggested here

TODO

• Check how to handle layout versioning
• Check with complex storage variable types (structs)
• Check with complex hierarchical (multiple inheritance) storage changes

Possible Enhancements

• Letting users opt-out of validation entirely or on a per-contract basis
• Give users more fine-grained control over which validation rules are enforced
  (Users may currently disable some checks)

[RoseRompkxm]

why is this still not merged? I think it's very useful

[noyyyy]

Any update on this? @wighawag

[0xlucian]

Hey any update on that? Wold be really useful

[fullkomnun]

@wighawag I can rebase or re-create it on top of the latest 'main' branch it that helps..

[waynehoover]

@wighawag This is essential to upgrading contracts.