Utilize existing HDPath class spec

### Overview

Try to use checkout https://github.com/ethereum/eth-account/blob/bd3dc2c0e85934b9c47980053d9f1d16a7540990/eth_account/hdaccount/deterministic.py#L187
for `HDPath` instead of using our own implementation.

Keep in mind that ours is a bit ledger-specific, so we may need to subclass or something.

### Specification

Rely on checkout https://github.com/ethereum/eth-account/blob/bd3dc2c0e85934b9c47980053d9f1d16a7540990/eth_account/hdaccount/deterministic.py#L187 for path validation (and class definition).

Just try (maybe a spike?)

### Dependencies

Include links to any open issues that must be resolved before this feature can be implemented.