Usage: keychain.getKeyForPath(path,type)
Description: Get a key from the keychain cache or generate if not yet existing

Parameters:

parameters	type	required	Description
path	string	yes	Enter a valid derivation path
type	string	no (default:HDPrivateKey)	Enter a valid type (one of: ['HDPrivateKey','HDPublicKey'])

Returns : HDPrivateKey

Example:

const { privateKey } = keychain.getKeyForPath(`m/44'/1'/0'/0'/0`);