feat: add support for email mfa

[harsh62]

Adding support for Email MFA:

• Depends on feat(auth): adding support for email mfa amplify-swift#3862

With these changes we have also made sure that Amplify's latest changes to email MFA won't break existing Authenticator. So Authenticator can safely take on the new version of Amplify with the new steps.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

Attention: Patch coverage is 74.11765% with 22 lines in your changes missing coverage. Please review.

Project coverage is 44.29%. Comparing base (1ec95fb) to head (c3bfde4).

Files with missing lines	Patch %	Lines
...urces/Authenticator/Utilities/PreviewFactory.swift	0.00%	9 Missing ⚠️
Sources/Authenticator/Models/Internal/Step.swift	0.00%	6 Missing ⚠️
.../States/ContinueSignInWithEmailMFASetupState.swift	86.20%	4 Missing ⚠️
...tes/ContinueSignInWithMFASetupSelectionState.swift	93.33%	2 Missing ⚠️
.../Authenticator/States/AuthenticatorBaseState.swift	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #94      +/-   ##
==========================================
+ Coverage   41.81%   44.29%   +2.48%     
==========================================
  Files          41       43       +2     
  Lines        1906     2472     +566     
==========================================
+ Hits          797     1095     +298     
- Misses       1109     1377     +268     

Flag	Coverage Δ
Authenticator	44.29% <74.11%> (+2.48%)	⬆️

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