Add support for latest ledger app

[TarikGul]

Summary

This PR focuses on giving @polkadot/hw-ledger the most recent support for the new ledger app - PolkadotGenericApp. This required a lot of large changes from the original Ledger class that was exposed. To avoid any breaking changes for legacy users we have created a new class called LedgerGeneric which focuses on the new changes and implements the PolkadotGenericApp. The interface has additions and major changes to the args that were accepted previously. Below I will lay out the new changes and how they work.

BREAKING CHANGE This PR deprecates class Ledger.

Whats New?

class LedgerGeneric

Initializing
new LedgerGeneric(transport: TransportType, chain: Chain, slip44: number, chainId?: string, metaUrl?: string): Promise<LedgerAddress>:

• chainId and metaUrl work together when you want to leverage a txMetadataSvrUrl within Zondax/ledger-substrate-js. This is specific for using sign and signRaw.

• When you want to use your own metadata you can use signWithMetadata.

getAddress

public async getAddress (ss58Prefix: number, confirm = false, accountIndex = 0, addressOffset = 0): Promise<LedgerVersion>:

sign

public async sign (message: Uint8Array, accountIndex?: number, addressOffset?: number): Promise<LedgerSignature>:

signRaw

public async signRaw (message: Uint8Array, accountIndex?: number, addressOffset?: number): Promise<LedgerSignature>:

signWithMetadata

public async signWithMetadata (message: Uint8Array, accountIndex?: number, addressOffset?: number, options?: Partial<AccountOptionsGeneric>): Promise<LedgerSignature>

[bee344]

Great job

[polkadot-js-bot]

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