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 75.64576% with 66 lines in your changes missing coverage. Please review.

Project coverage is 81.99%. Comparing base (8ed4c75) to head (245c79e).

Files with missing lines	Patch %	Lines
secure_storage_manager.go	76.06%	62 Missing ⚠️
os_specific_posix.go	80.00%	2 Missing ⚠️
os_specific_windows.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1327      +/-   ##
==========================================
- Coverage   82.09%   81.99%   -0.11%     
==========================================
  Files          55       57       +2     
  Lines       13724    13868     +144     
==========================================
+ Hits        11267    11371     +104     
- Misses       2457     2497      +40     

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