SNOW-1825790 Implement safer file based token cache

[sfc-gh-pfus]

Description

SNOW-1825790 Implement safer file based token cache

Checklist

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

[codecov]

Codecov Report

Attention: Patch coverage is 74.58194% with 76 lines in your changes missing coverage. Please review.

Project coverage is 81.90%. Comparing base (8ed4c75) to head (ffad6d7).

Files with missing lines	Patch %	Lines
secure_storage_manager.go	76.17%	66 Missing ⚠️
os_specific_posix.go	66.66%	6 Missing ⚠️
os_specific_windows.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1327      +/-   ##
==========================================
- Coverage   82.09%   81.90%   -0.19%     
==========================================
  Files          55       57       +2     
  Lines       13724    13902     +178     
==========================================
+ Hits        11267    11387     +120     
- Misses       2457     2515      +58     

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[sfc-gh-jszczerbinski]

LGTM