feat: add fields support to facebook provider

[ozancakir]

• Facebook provider was only fetching 'id' and 'name' fields, I have added config.fields support.
• Facebook login redirects with /#= , to avoid ugly and wrong url hash, I have added how to remove it efficiently with nuxt3 server hooks to playground, (https://stackoverflow.com/questions/7131909/facebook-callback-appends-to-return-url)

[atinux]

Thanks @ozancakir

I moved the server plugin in the core directly if facebook is enabled :)