Replace ethereumjs-wallet's hdkey with ethereum-cryptography's version

[adonesky1]

Replaces ethereumjs-wallet implementation of hdkey  with one from ethereum-cryptography and adapts accordingly.
This is part of a broader effort to remove ethereumjs-wallet from our dependency graph for the purpose of reducing overall bundle size. ethereumjs-wallet is heavier and less well maintained than ethereum-cryptography/hdkey.

[socket-security]

Socket Security Pull Request Report

👍 No new dependency issues detected in pull request

Pull request report summary

Issue	Status
Install scripts	✅ 0 issues
Native code	✅ 0 issues
Bin script confusion	✅ 0 issues
Bin script shell injection	✅ 0 issues
Unresolved require	✅ 0 issues
Invalid package.json	✅ 0 issues
HTTP dependency	✅ 0 issues
Git dependency	✅ 0 issues
Potential typo squat	✅ 0 issues
Known Malware	✅ 0 issues
Telemetry	✅ 0 issues
Protestware/Troll package	✅ 0 issues

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[Gudahtt]

LGTM!