Display built-in plugins

[vitaliy-guliy]

Description

Display built-in (default) plugins in the list of installed plugins. We have to indicate somehow that plugin is default ( provided by Theia editor docker image ).
Default plugins are always present on the file system and cannot be removed.

[vitaliy-guliy]

I have already did some work on this issue and included plugins in the list. But there is still a lot of work on plugin decorations.

[sunix]

@vitaliy-guliy i don't think we want to display these plugins ... not needed for customers

[benoitf]

I think it's useful to see them and to not have a way to install/uninstall them

it's like default apps on Android or Extensions in VS Code, there are there but you can't uninstall them

[sunix]

@benoitf yes, just displaying them would be fine. It would be bad to give to much power to the enduser ... and break his workspace easily.

[vitaliy-guliy]

Is already implemented