[6.x] Update make:fieldtype stubs

[duncanmcclean]

This pull request updates the stubs used by the php please make:fieldtype command, updating it for Statamic 6 & Vue 3.

This PR also includes some small, related changes:

• When running make:fieldtype, if the application isn't setup for CP JavaScript, it'll suggest running the setup-cp-vite command.
• When running make:fieldtype to generate an addon fieldtype, it'll now run npm install after copying over the package.json and vite.config.js stubs, so npm run build works right away.
• Converted the Vue component stub to the Composition API and updated the example (I've updated the docs to go alongside this).
• The setup-cp-vite command previously had its own ExampleFieldtype.vue stub. It now uses the same stub as make:fieldtype.
• Updated the version of Vite used in the addon package.json stub so its compatible with @vitejs/plugin-vue.
• Updated tests for the make:fieldtype command
• Added tests for the setup-cp-vite command

[duncanmcclean]

Marking this as a draft until I get the tests figured out.