feat: add apiVersion to cloudimage provider

[TiborPL]

Newly created Cloudimage tokens don't need v7 in url which was hardcoded.
Made optional option apiVersion. Kept v7 as default so not to break old codes.

Also clarified the documentation regarding new tokens and api version.

👉 Migration

If you have been using cloudimage provider with a legacy token, you will need to add the apiVersion: 'v7' to your nuxt.config:

  export default defineNuxtConfig({
    modules: ['@nuxt/image'],
    image: {
      cloudimage: {
        token: 'demo',
        baseURL: 'sample.li',
+       apiVersion: 'v7'
      },
    }
  })

[ghost]

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[danielroe]

I think it would probably be fine to change the default behaviour as a breaking change pre v1 release.