message: refactor(account-lib): add jsdoc getPublicKey/getPrivateKey
  Issue:
diff: @@ -33,10 +33,17 @@ export abstract class Secp256k1ExtendedKeyPair implements BaseKeyPair {
  this.source = source;
  }
  + /**
  + * @param compressed
  + * @return Buffer 33 bytes if `compressed` is set, 65 bytes otherwise. Standard libsecp256k1 format.
  + */
  getPublicKey({ compressed }: { compressed: boolean }): Buffer {
  return ECPair.fromPublicKey(this.keyPair.publicKey, { compressed }).publicKey;
  }
  + /**
  + * @return Buffer 32 bytes in standard libsecp256k1 format
  + */
  getPrivateKey(): Buffer | undefined {
  return this.keyPair.privateKey;
  }
  