Add gjs support

Author: kategengler

package.json

@@ -40,8 +40,6 @@
     "@embroider/webpack": "^3.2.1",
     "@glimmer/component": "^1.1.2",
     "@glimmer/tracking": "^1.1.2",
-    "@glint/core": "^0.9.7",
-    "@glint/environment-ember-loose": "^0.9.7",
     "@percy/cli": "^1.28.7",
     "@percy/ember": "^4.2.0",
     "@tsconfig/ember": "^1.0.1",
@@ -104,6 +102,7 @@
     "ember-source": "~4.12.0",
     "ember-styleguide": "^11.0.3",
     "ember-svg-jar": "^2.4.2",
+    "ember-template-imports": "^4.3.0",
     "ember-template-lint": "^7.9.3",
     "ember-test-selectors": "^6.0.0",
     "ember-tether": "3.1.0",
@@ -132,6 +131,7 @@
     "normalize.css": "^8.0.1",
     "prember": "^2.1.0",
     "prettier": "^2.8.7",
+    "prettier-plugin-ember-template-tag": "^2.1.0",
     "qunit": "^2.19.4",
     "qunit-dom": "^2.0.0",
     "sanitize-html": "^2.3.2",