Add support for Facebook auth JWT token about parse-server

[parse-github-assistant]

Thanks for opening this issue!

• 🎉 We are excited about your ideas for improvement!

[mtrezza]

Note: The bounty scope includes parse-community/Parse-SDK-iOS-OSX#1787.

[mtrezza]

For reference, here the PR that implemented FB limited login server side: #7219. It defined:

Classic Graph API login (no change)

{
  id: "your_facebook_id",
  access_token: "facebook_graph_api_access_token"
}

Limited Login

{
  id: "your_facebook_id",
  token: "openid_token"
}

[parseplatformorg]

🎉 This change has been released in version 6.5.6

[parseplatformorg]

🎉 This change has been released in version 7.1.0-alpha.7