fix add type="email" to input field when usernameAttribute=email

[alpsayin]

Issue #, if available:

Description of changes:
By setting the input field type to email, we make the browser's and input devices' jobs easier by suggesting this is an email field. Visible changes are;
-Email address suggestions from browser
-Tablet devices pop-up keyboards with lowercase letters as default.

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

[codecov]

Codecov Report

Merging #4199 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4199   +/-   ##
=======================================
  Coverage   71.59%   71.59%           
=======================================
  Files         166      166           
  Lines       10023    10023           
  Branches     2021     2021           
=======================================
  Hits         7176     7176           
  Misses       2501     2501           
  Partials      346      346

Impacted Files	Coverage Δ
packages/aws-amplify-react/src/Auth/AuthPiece.tsx	87.77% <ø> (ø)	⬆️

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[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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