Provides @eclipse-che/plugin namespace to VS Code extensions

Is your enhancement related to a problem? Please describe.

Today, VS Code extensions don’t have access to @eclipse-che/plugin namespace and if they’re linking to this module it may not be deployed easily on VS Code.

Describe the solution you’d like

Export @eclipse-che/plugin namespace as a VS Code extension export through a Theia plug-in (that has access to the namespace for example) https://code.visualstudio.com/api/references/vscode-api#extensions

VS Code extensions wanting to use Che features could then do:

const eclipseChePluginExport = vscode.extensions.getExtension('@eclipse-che/plugin');
if (eclipseChePluginExport) {
   eclipseChePluginExport.workspace.getCurrentWorkspace()
}

Describe alternatives you’ve considered

N/A

Additional context

Leverage VS Code extension paradigm

[fbricon]

@azatsarynnyy summarized it best. I can work with both solutions. #1 didn’t work for me initially though, #2 worked immediately, so I’m totally OK with it

[benoitf]

merged in 7.27