[browser] cannot use the 'paste' menu item in the browser application

Copy & Paste 1- Why don't we have those two options in the context menu of the editor ? 2- In the top menu bar of Theia, Copy / Paste are available, but no key accelerator for the Paste 3- After doing of some code copy, we cannot use the "Paste" from the top menu, a dialog says to use the browser paste or shortcut, --> Paste from Theia menu does not work We should be able to trigger the PASTE from the browser when selecting the Paste option from Theia Compare to eclipse editor, "Copy" and "Paste" are available form the menu, context menu in the editor and have accelerator for it.