feat: add qr keyring package

[mikesposito]

This is a WIP implementation of a Keyring compatible with Keystone QR hardware

Examples

[danroc]

Thank you @mikesposito! Maybe we should import this using git merge --allow-unrelated-histories (+ manual fixes) to keep the history from the original repo.

[mikesposito]

@danroc this PR is not moving the package from another source - this is a new implementation, and only shares a similar account derivation strategy from URs with the original keyring package currently used on clients

Do you think we should bring in its commit history anyway? Also, the package is in a Keystone monorepo, which would include commits to other packages potentially unrelated

[danroc]

Sorry @mikesposito, I didn't realise it was a new implementation! In this case it makes sense to start fresh, thank you for the clarification.