Update VS Code extension to use .NET language server (#453)

* Use new .NET language server

* Bring over refactored vscode extension from gfs/VsCodeRewrite

* Update dependencies and framework versions

* Restructure vscode extension folders

* Update vscode launch configs

* Update .gitignore

* Update vscode build scripts and configurations

* Add debug logging and client/server trace option

* Add xml as language

* Move client-side processing to the language server

* Add JSON to activation events for VS Code Client

* Disable vscode release stage from pipeline

---------

Co-authored-by: Gabe Stocco <98900+gfs@users.noreply.github.com>

Author: daalcant

.gitignore

@@ -1,4 +1,5 @@
 *.vsix
 DevSkim-DotNet/Microsoft.DevSkim.sln.DotSettings.user
 DevSkim-DotNet/Microsoft.DevSkim.CLI/output.json
+DevSkim-VSCode-Plugin/client/dist/*
 DevSkim-VSCode-Plugin/devskimBinaries/*

.vscode/extensions.json

@@ -0,0 +1,9 @@
+{
+	// See https://go.microsoft.com/fwlink/?LinkId=827846 to learn about workspace recommendations.
+	// Extension identifier format: ${publisher}.${name}. Example: vscode.csharp
+
+	// List of extensions which should be recommended for users of this workspace.
+	"recommendations": [
+		"dbaeumer.vscode-eslint"
+	]
+}