refactor: extract artifacts to a separate crate

[klkvr]

Closes https://github.com/foundry-rs/compilers/issues/129

Divides foundry-compilers into 3 crates:

• foundry-compilers-artifacts - JSON artifacts for Solc and Vyper compilers
• foundry-compilers-project - Project related logic, including compiler abstraction and compilation pipeline
• foundry-compilers-core - error types and utilties shared by both crates