app: upgrade native application without restarting system

[yorkie]

Currently all the native applications are required to be at rootfs which could be upgraded with the system OTA, that is quite huge a bit than the third-party products.

Thus the new component to upgrade application requires the following to be done:

• Progress to install the application: download, checksum and install.
• Consider the case the application is working, when to install.
• Define the package format.

Package registry must support the below features:

• Get package by the following versions: Node.js, YodaOS and runtime API level.
• Server pushing updates via MQTT/Wormhole.
• Include the following files: JavaScript, JSON, libraries and executables.

[qile222]

todo list:

• provide platform tools for app packaging
• app only need to provide API level to confirm whether it works properly, the version of the distribution channel is limited by the cloud
• move third party app to /data, since every app directory should includes data directory and executable directory, only update the executable directory while update
• support batch publish via MQTT
• interaction while updating

- in this phase, we publish the app manually, automated publishing needs to be supported later