Provide a way to allow pass config into typescript plugin extension

[Kingwl]

As the current behavior We cannot pass config into a extension who based on typescript plugin.

Could we find some way to specify which config we does care and pass them into typescript plugin config?

eg:

{
	"contributes": {
		"typescriptServerPlugins": [{
			"name": "any plugin",
			"enableForWorkspaceTypeScriptVersions": true,
			"configs": {
				"configA": "anyPlugin.barrrrrr",
				"configB": "anyPlugin.foooooo"
			}
		}],
		"configuration": {
			"title": "TypeScript",
			"properties": {
				"anyPlugin.barrrrrr": {
					"type": "boolean",
					"default": false,
					"description": "desc"
				},
				"anyPlugin.foooooo": {
					"type": "boolean",
					"default": false,
					"description": "desc"
				}
			}
		}
	}
}

And then we could use the config by typescript plugin config as here

[mjbvz]

Extensions can use the TypeScript extension's configurePlugin api for this

Here's an example of how TSLint uses this the api:
https://github.com/microsoft/vscode-typescript-tslint-plugin/blob/6b41f866243e0526ee1dddbc8de55155f157c93a/src/index.ts#L55

This allow an extension to send whatever information it wants to a plugin, instead of making VS Code responsible for synchronizing the configuration on behalf of the extension

[Kingwl]

thanks