Support Global Launch Configuration

[RomanNikitenko]

Feature Description:

VS Code supports adding launch configurations to user settings.

Please see more details here: https://code.visualstudio.com/docs/editor/debugging#_global-launch-configuration

[RomanNikitenko]

Theia supports launch configurations on User level.
But there are at least 2 bugs related to launch configurations:

• launch configurations defined within user settings are not available for running (not displayed in Debug panel) if launch configurations are present in .theia/launch.json or .vscode/launch.json
• User level launch configurations are associated with folders

Theia has similar issues for Workspace-scoped launch configurations:

• Launch configurations are not available for running Launch configurations are not available for running  #8987
• Workspace-scoped launch configurations of multi-root workspace are associated with folders Workspace-scoped launch configurations of multi-root workspace are associated with folders #8985

So to get Global launch configurations support for Theia the issues #8987 and #8985 should be fixed.