Feat/classic hd derivation path

[meowsbits]

This PR builds from and replaces #452 (thanks @ziogaschr) which provided the pattern for configurable HD derivation path support. This branch has been rebased on master since then.

When --usb is used in conjunction with --classic or any testnet value (eg. --sepolia), the accounts package defaults will be configured accordingly for the HD derivation path logic and defaults.

Comments are left using Ethereum Classic values as examples.

[ziogaschr]

Great work @meowsbits. I want to give it a test with Ledger before approving it.

[ziogaschr]

@meowsbits just tested it with Ledger and it works great.

I am wondering * if it makes sense to use the ETHClassic Slip (0x3d) for its testnets (Mordor & Kotti). That way, UX will not be confusing. I wanted to try using the Ledger's ETC app (accounts) on Mordor and it wasn't working. I am totally fine merging this PR as it is, as it is inline with the spec.

• SLIP-0044: I checked that Slip suggests CoinType=1 for all testnets.

Nice work.

[meowsbits]

What about a flag that would override (or "define with -force"?) the value?

• --usb.coin-type-id or,
• --usb.slip0044-id or, ...
• --usb.pathid, --usb.path-component, ...

[ziogaschr]

What about a flag that would override (or "define with -force"?) the value?

• --usb.coin-type-id or,
• --usb.slip0044-id or, ...
• --usb.pathid, --usb.path-component, ...

Nice solution. I vote towards --usb.coin-type-id or --usb.pathid, but I am leaving the decision to you.

[meowsbits]

Last two commits add --usb.pathid.

[ziogaschr]

Works great. Let's merge it @meowsbits.