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)

tests/unit/Components.spec.js

@@ -1,5 +1,6 @@
+import { it, describe, expect } from 'vitest'
 import { defineComponent } from 'vue'
-import { selectWithProps } from '../helpers'
+import { selectWithProps } from '@tests/helpers.js'
 
 describe('Components API', () => {
   it('swap the Deselect component', () => {