[Social Auth] Add Google & Facebook providers

[LoicPoullain]

Issue

See #125

Solution and steps

• Set up the test environment.
  • Create a Google account.
  • Register a test application with the Google account and save the credentials in Github secrets.
  • Create a Facebook account.
  • Register a test application with the Facebook account and save the credentials in Github secrets
• Create simple applications (samples) using social auth.
  • Google 1
  • Google 2
  • Facebook
• Add @foal/social package.
  • Create the package.
  • Define the interface and algorithm of AbstractProvider.
  • Add the concrete providers (props only).
  • Implement and test AbstractProvider.
  • Implement and test the providers.
• Write the documentation.
  • Write Google 1 documentation.
  • Write Google 2 documentation.
  • Write Facebook documentation.
  • How to implement your own provider (mention that settings.social is reserved).

Checklist

• Add/update/check docs (code comments and docs/ folder).
• Add/update/check tests.
• Update/check the cli generators.

External links

https://oauth.net/2/
https://github.com/laravel/socialite
https://developers.google.com/identity/protocols/OpenIDConnect
https://developers.facebook.com/docs/facebook-login/manually-build-a-login-flow/
https://developers.facebook.com/docs/facebook-login/permissions/
https://developers.facebook.com/docs/graph-api/reference/user/

[codecov]

Codecov Report

Merging #563 into v1-3-0 will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           v1-3-0     #563   +/-   ##
=======================================
  Coverage   99.57%   99.57%           
=======================================
  Files          88       88           
  Lines        1635     1635           
  Branches      372      373    +1     
=======================================
  Hits         1628     1628           
  Misses          7        7

Impacted Files	Coverage Δ
packages/core/src/sessions/token.hook.ts	100% <ø> (ø)	⬆️
packages/core/src/sessions/token-required.hook.ts	100% <ø> (ø)	⬆️
packages/core/src/sessions/token-optional.hook.ts	100% <ø> (ø)	⬆️

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