feat: add support for email mfa

[harsh62]

Description of changes:

Adding support for Email MFA:

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

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[codecov]

Codecov Report

Attention: Patch coverage is 41.93548% with 36 lines in your changes missing coverage. Please review.

Project coverage is 41.78%. Comparing base (1ec95fb) to head (b855272).

Files with missing lines	Patch %	Lines
.../States/ContinueSignInWithEmailMFASetupState.swift	0.00%	22 Missing ⚠️
...urces/Authenticator/Utilities/PreviewFactory.swift	0.00%	7 Missing ⚠️
Sources/Authenticator/Models/Internal/Step.swift	0.00%	4 Missing ⚠️
...tes/ContinueSignInWithMFASetupSelectionState.swift	91.30%	2 Missing ⚠️
.../Authenticator/States/AuthenticatorBaseState.swift	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #94      +/-   ##
==========================================
- Coverage   41.81%   41.78%   -0.03%     
==========================================
  Files          41       43       +2     
  Lines        1906     1967      +61     
==========================================
+ Hits          797      822      +25     
- Misses       1109     1145      +36     

Flag	Coverage Δ
Authenticator	41.78% <41.93%> (-0.03%)	⬇️

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