Cross-platform support for @nuxt/image

Following warning was produced in production build:

> sharp binaries have been included in your build for win32-x64. Make sure you deploy to the same architecture.

It is caused by default behavior https://image.nuxt.com/get-started/installation#sharp-cross-platform-installation

Adding all options will bloat the bundle. In fact, it is bloating the bundle even now.

We should find a way of mitigating the situation and let users opt-in into having sharp