SNOW-1490901 Passcode support for mfa authentication

[sfc-gh-knozderko]

Description

SNOW-1490901 Passcode support for mfa authentication

Checklist

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

[codecov[bot]]

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 :warning:
...nowflake.Data/Core/Authenticator/IAuthenticator.cs	93.33%	0 Missing and 1 partial :warning:
...ke.Data/Core/Authenticator/KeyPairAuthenticator.cs	0.00%	1 Missing :warning:
Snowflake.Data/Core/RestRequest.cs	75.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ 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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