Isidorn/compound

[isidorn]

fixes #14842

We now support the followin syntax for launching multiple configurations at once

{
	"version": "0.2.0",
	"configurations": [
		{
			"type": "mock",
			"request": "launch",
			"name": "Mock-Debug",
			"program": "${workspaceRoot}/readme.md",
			"stopOnEntry": true
		},
		{
			"type": "node",
			"request": "launch",
			"name": "Launch Program",
			"program": "${workspaceRoot}/fib.js",
			"cwd": "${workspaceRoot}"
		}
	],
	"compounds": [
		{
			"name": "Compound",
			"configurations": ["Mock-Debug", "Launch Program"]
		}
	]
}

[mention-bot]

@isidorn, thanks for your PR! By analyzing the history of the files in this pull request, we identified @jrieken, @egamma and @bpasero to be potential reviewers.