BIP-44

### What should be done?

[BIP-44](https://en.bitcoin.it/wiki/BIP_0044) is a standard that helps Hierarchical Wallets integrate with many chains. Its purpose is to enable a single seed phrase to work across networks and across wallet providers.

We should ensure that Miden has a BIP-44 network id

### How should it be done?

Decide on a network id and open a PR here: https://github.com/bitcoinjs/bip44-constants

### When is this task done?

The sooner the better. This will determine how seed phrase -> private key so if it'll be good to finalize this sooner than later. Certainly before mainnet and probably before any incentivized testnet activity.

### Additional context

_No response_

The task is to decide on a BIP-44 network ID for Miden and submit a PR to the bitcoinjs/bip44-constants repository. Start by reviewing the BIP-44 standard and the existing constants in that repository to understand the format. Determine a suitable unused network ID for Miden, then follow the repository's contribution guidelines to open a pull request. The work is done when the PR is merged, integrating Miden into the standard.

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