0.7.0

Changes

• Publish crates to crates.io instead of the cartesi private registry.
• Remove all mentions of the cartesi private registry.
• Add eth- prefix to all crate names. Since the crates are published
  to the public registry, names had to be improved. This prefix in
  particular was chosen as it is specific to the Ethereum base layer.
• Rewrite readme.
• Remove outdated examples.
• Trigger CI workflows only on relevant file types.
• Update dependencies.

Fix

• Apply all clippy suggestions; suppress warnings too complicated to
  fix with low impact.