Allow extension in untrusted workspaces

[John Murray]

Once VS Code 1.57 ships extensions will default to being disabled in every workspace until the user declares that they trust the workspace. See microsoft/vscode#120251 and https://code.visualstudio.com/docs/editor/workspace-trust

This extension doesn't expose the user to any risks which the contents of a workspace could pose, so we should mark it appropriately in its package.json

	"capabilities": {
		"untrustedWorkspaces": {
			"supported": true
		}
	},

I will submit a PR.

[John Murray]

@daimor please do the same for vscode-objectscript

@isc-bsaviano please do likewise for language-server

[Brett Saviano]

@gjsjohnmurray Done. LS 1.2.0 is live