v0.4.0

What's Changed

• Add Docker caching and Buildx setup by @steebchen in #51
• Threadpool refactor by @piniom in #52
• Bumped cairo-vm version by @piniom in #54
• Update cache keys with branch names in CI workflows by @steebchen in #56
• Fix/sdk format by @chudkowsky in #55
• Enable Docker build caching in GitHub Actions workflow by @steebchen in #58
• Fix: replace ProverInput generic for an enum by @piniom in #57

Full Changelog: v0.3.0...v0.4.0