* feat(API): rename all *userKey[s] methods to *apiKey[s]
    * client/index.listUserKeys() => client/index.listApiKeys()
    * client/index.getUserKeyACL() => client/index.getApiKey()
    * client/index.deleteUserKey() => client/index.deleteApiKey()
    * client/index.addUserKey() => client/index.addApiKey()
    * client/index.udpateUserKey() => client/index.updateApiKey()
  * fix(packaging): remove useless files for packaging (reduce package file size)