Adds support to Enroll / Verify / List / Challenge / Delete Multi Factor Authenticators

[kailash-b]

Changes

• Changes built on top of contributions from czf in Support for listing authenticators and deleting specific authenticator #698 Adding authenticator enrollment and verification to authentication client #695
• /mfa/challenge
• /oauth/token - with otp
• /oauth/token - with oob
• /oauth/token - with recovery code
• /mfa/associate
• /mfa/authenticators
• /mfa/authenticators/{AUTHENTICATOR_ID}
• Refactored the AuthenticationClient class to improve Test Coverage and maintenance.
• Added a new Examples.md file and updated it with examples related to MFA

References

Please include relevant links supporting this change such as a:

• Support for listing authenticators and deleting specific authenticator #698
• Adding authenticator enrollment and verification to authentication client #695
• SDK-5683

Testing

Added unit and integration test cases to cover Enroll, List, Delete, Challenge and verify scenarios.

• This change adds unit test coverage

• This change adds integration test coverage

• This change has been tested on the latest version of the platform/language or why not

Checklist

• I have read the Auth0 general contribution guidelines

• I have read the Auth0 Code of Conduct

• All existing and new tests complete without errors

[codecov]

Codecov Report

Attention: Patch coverage is 92.52874% with 13 lines in your changes missing coverage. Please review.

Project coverage is 74.07%. Comparing base (c654e7f) to head (0b8918c).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
...Auth0.AuthenticationApi/AuthenticationApiClient.cs	94.64%	6 Missing ⚠️
...uthenticationApi/Models/Mfa/MfaOobTokenResponse.cs	33.33%	2 Missing ⚠️
...uthenticationApi/Models/Mfa/MfaChallengeRequest.cs	85.71%	1 Missing ⚠️
...AuthenticationApi/Models/Mfa/MfaOobTokenRequest.cs	85.71%	1 Missing ⚠️
...AuthenticationApi/Models/Mfa/MfaOtpTokenRequest.cs	83.33%	1 Missing ⚠️
...enticationApi/Models/Mfa/MfaRecoveryCodeRequest.cs	83.33%	1 Missing ⚠️
...nticationApi/Models/Mfa/MfaRecoveryCodeResponse.cs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #798      +/-   ##
==========================================
+ Coverage   72.87%   74.07%   +1.20%     
==========================================
  Files         426      438      +12     
  Lines        5526     5663     +137     
  Branches      364      346      -18     
==========================================
+ Hits         4027     4195     +168     
+ Misses       1332     1316      -16     
+ Partials      167      152      -15     

Flag	Coverage Δ
authIntTests	30.09% <92.52%> (+2.49%)	⬆️
mgmtIntTests	57.35% <1.72%> (-1.37%)	⬇️
unittests	3.95% <ø> (ø)

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