Add support for developer authenticated strategies

[buggy]

Issue #, if available:

#308 and #416

Description of changes:

This PR add developer to the list of domainssetCredentialsFromFederation() will accept credentials for. After this change you sign in using developer authenticated credentials from a Cognito Identity Pool with federatedSignIn() by passing developer as the provider.

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 #425 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master     #425   +/-   ##
=======================================
  Coverage   91.29%   91.29%           
=======================================
  Files          56       56           
  Lines        2687     2687           
  Branches      538      538           
=======================================
  Hits         2453     2453           
  Misses        222      222           
  Partials       12       12

Impacted Files	Coverage Δ
packages/aws-amplify/src/Auth/Auth.ts	90.78% <0%> (ø)	⬆️

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[nminchowNelnet]

@buggy - would it be possible to get some more info on how this is supposed to work? Whenever I call federatedSignIn() like so:

Auth.federatedSignIn(
  'developer',
  {
      // The token I get back from 'GetOpenIdTokenForDeveloper'
      token: "eyJr(...)",
  }
)

I get the following 400 back when the call to "https://cognito-identity.us-east-2.amazonaws.com/" is made: Error: Invalid login token. Can't pass in a Cognito token.

I think these changes may fix my issue: #562, but I'm curious how this works without them.

[github-actions]

This pull request has been automatically locked since there hasn't been any recent activity after it was closed. Please open a new issue for related bugs.

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