SNOW-1503458 Allow using passcode with MFA token caching enabled

[sfc-gh-pfus]

Description

SNOW-1503458 Added possibility to specify passcode while using MFA token caching

Checklist

• [x] Created tests which fail without the change (if possible)
• [x] Extended the README / documentation, if necessary

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 28.57143% with 5 lines in your changes missing coverage. Please review.

Project coverage is 71.58%. Comparing base (5d28db8) to head (86e3715). Report is 5 commits behind head on master.

Files	Patch %	Lines
auth.go	28.57%	5 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1167 +/- ## ========================================== - Coverage 72.34% 71.58% -0.77% ========================================== Files 53 54 +1 Lines 11909 12092 +183 ========================================== + Hits 8616 8656 +40 - Misses 3293 3436 +143 ```

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