build(vite): replace webpack with Vite, add Typescript (#1594)

BREAKING: mixins are no longer exported from the index (and will likely be converted to hooks)

jsconfig.json

@@ -0,0 +1,10 @@
+{
+    "compilerOptions": {
+        "baseUrl": ".",
+        "paths": {
+            "@/*": ["src/*"],
+            "@tests/*": ["tests/*"]
+        }
+    },
+    "exclude": ["node_modules", "dist", "coverage", "docs"]
+}