v5.8.1

Contributed:

• Add ss58 information for HydraDX (Thanks to https://github.com/jak-pan)
• HD derivation for Ethereum (Thanks to https://github.com/joelamouche)

Changes:

• Adjust base64 encoding/decoding to not rely on Buffer being available
• Rework Ethereum derivation to only use Uint8Array internally
• Shared HD path validation for Ledger & Ethereum
• Additional derivation, encoding and decoding tests on keyring
• Align networks with upstream ss58 registry
• @polkadot/wasm-crypto 3.2.4