From Failure into std::error::Error

[bltavares]

Choose one: a 🙋 feature

This PR moves from failure crate into a boxed std::error::Error using the anyhow.

Checklist

• tests pass
• tests and/or benchmarks are included
• documentation is changed or added

Context

• Change stack from failure to std::error::Error hypercore#101

Semver Changes

major/minor as a breaking changing on the API.