Initial Profiler extension scaffolding (#1451)

* Copy agent to profiler extension

* A few mote edits

build/gulpfile.vscode.js

@@ -77,7 +77,8 @@ const vsce = require('vsce');
 const sqlBuiltInExtensions = [
 	// Add SQL built-in extensions here.
 	// the extension will be excluded from SQLOps package and will have separate vsix packages
-	'agent'
+	'agent',
+	'profiler'
 ];
 
 const vscodeEntryPoints = _.flatten([

build/npm/postinstall.js

@@ -35,7 +35,8 @@ const extensions = [
 	'merge-conflict',
 	'insights-default',
 	'account-provider-azure',
-	'agent'
+	'agent',
+	'profiler'
 ];
 
 extensions.forEach(extension => yarnInstall(`extensions/${extension}`));