Implement wasm-based seed conversion for HD-Wallet native

[woodenfurniture]

Description

Mobile devices spend around 3.5s on app boot converting the mnemonic to a BIP32 seed. Looking into the HDWallet source code we see a TODO to reimplement it:
packages/hdwallet-native/src/crypto/isolation/engines/default/bip39.ts

Additional details

The existing implementation of pbkdf2_sha512_singleblock may be replaceable with pbkdf2 from hash-wasm, for example:

import { createSHA512, pbkdf2 } from "hash-wasm";

// ...

const out = await BIP32Engine.Seed.create(
      Buffer.from(
        await pbkdf2({
          password: mnemonic,
          salt,
          iterations: 2048,
          hashLength: 64,
          hashFunction: createSHA512(),
          outputType: "binary",
        })
      )
    );

Acceptance criteria

• Native wallet can connect / disconnect / transact as normal
• Improved app boot time

[0xApotheosis]

HDWallet PR: shapeshift/hdwallet#648