federated sign in for react native

[powerful23]

Issue #, if available:

Description of changes:

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-io]

Codecov Report

Merging #818 into master will decrease coverage by 0.02%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #818      +/-   ##
==========================================
- Coverage   87.75%   87.72%   -0.03%     
==========================================
  Files          77       77              
  Lines        3666     3667       +1     
  Branches      693      693              
==========================================
  Hits         3217     3217              
- Misses        426      427       +1     
  Partials       23       23

Impacted Files	Coverage Δ
packages/aws-amplify/src/Auth/Auth.ts	88.03% <66.66%> (-0.14%)	⬇️

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[sky1234]

What is this fixing/enhancing? is it adding the federated signin feature for React Native. Please clarify.

[powerful23]

@sky1234 This pr will allow developers to use Auth.federatedSignIn() in React Native to get a federated identity from third providers. Also fixes some issue of the Authenticator so now you will be logged in once you sign in with third provider

[sky1234]

Thats great. if you can update documentation on "Authentication" section, that would be ideal. it specifically states Federated identity is not supported at multiple places. Please update, along with code fix.

[github-actions]

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