[Enhancement] Linux: Embed AppImage update information

[shuvashish76]

Summary
AppImage Delta updates

When trying to update via AppImageUpdate

Motivation
This is a common standard for updating AppImages.
AppImage having update information would also recognized by other software e.g. AppImageLauncher

Updating will take less amount of data and time due downloading only diff.

Proposed Solution
info:

• https://github.com/AppImageCommunity/AppImageUpdate#update-information-overview
• https://github.com/AppImage/AppImageSpec/blob/master/draft.md#update-information
• https://github.com/ivan-hc/AppImage-tips