Sync files from Deep with folder on disk in any operating system

This issue can be done as alternative to https://github.com/deep-foundation/dev/issues/125, but in this case it will allow to use any IDE with SyncTextFile links.

For SyncTextFile we can use Supports links to determine which file extension should be for that file.
The name of the file should be defined via Contain link's value.

For AsyncFile we can use files table with metadata to determine the file extension.
The name of the file should be defined via Contain link's value.

Users, Spaces, Packages should be interpreted as folders.

At the moment if the name of file is not defined in the Contain link's value, then this link is not exported as file. When we create supported file in the file system SyncTextFile/AsyncFile with appropriate name in Contain link should be created.

This should be done as CLI that can synchronize on demand or on changes in files.

This feature can be also used to synchronize multiple folders for example iCloud, Google Drive, Dropbox and so on.

https://habr.com/ru/articles/777252/#comment_26211370 - additional info about the problem.