SNOW-1490901 Passcode support for mfa authentication

[sfc-gh-knozderko]

Description

SNOW-1490901 Passcode support for mfa authentication

Checklist

• Code compiles correctly
• Code is formatted according to Coding Conventions
• Created tests which fail without the change (if possible)
• All tests passing (dotnet test)
• Extended the README / documentation, if necessary
• Provide JIRA issue id (if possible) or GitHub issue id in PR name

[codecov]

Codecov Report

Attention: Patch coverage is 94.73684% with 4 lines in your changes missing coverage. Please review.

Project coverage is 85.66%. Comparing base (393762a) to head (434b03d).

Files	Patch %	Lines
...Core/Authenticator/ExternalBrowserAuthenticator.cs	0.00%	1 Missing ⚠️
...nowflake.Data/Core/Authenticator/IAuthenticator.cs	93.33%	0 Missing and 1 partial ⚠️
...ke.Data/Core/Authenticator/KeyPairAuthenticator.cs	0.00%	1 Missing ⚠️
Snowflake.Data/Core/RestRequest.cs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #979      +/-   ##
==========================================
+ Coverage   85.58%   85.66%   +0.07%     
==========================================
  Files         106      106              
  Lines       10759    10803      +44     
  Branches     1029     1034       +5     
==========================================
+ Hits         9208     9254      +46     
+ Misses       1303     1299       -4     
- Partials      248      250       +2     

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