Support Surface templates (#597)

Surface support is defined here https://github.com/msaraiva/vscode-surface/blob/master/syntaxes/surface.json

See #407 and 1253902

Author: joshprice

packages/tailwindcss-language-service/src/util/languages.ts

@@ -29,6 +29,7 @@ export const htmlLanguages = [
   'php',
   'razor',
   'slim',
+  'surface',
   'twig',
 ]