Make vite a peer dependency for plugin-vite

[chrispcampbell]

Currently plugin-vite lists vite as a hard dependency:

  "dependencies": {
    "vite": "^3.1.3"
  },

Since this plugin is meant to be used to run some arbitrary vite build step as part of the overall SDE build process, it would be better to list vite as a peer dependency so that the parent project can control which version is used. (Any 3.x version should work.)