Snow 1825500 oauth2 default endpoints support

[sfc-gh-pfus]

Description

SNOW-1825500 Added support for default Snowflake endpoints

Checklist

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

[codecov]

Codecov Report

Attention: Patch coverage is 73.33333% with 4 lines in your changes missing coverage. Please review.

Please upload report for BASE (SNOW-1825500-oauth2@eabd166). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
auth_oauth.go	73.33%	4 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                   @@
##             SNOW-1825500-oauth2    #1330   +/-   ##
======================================================
  Coverage                       ?   81.85%           
======================================================
  Files                          ?       56           
  Lines                          ?    14029           
  Branches                       ?        0           
======================================================
  Hits                           ?    11483           
  Misses                         ?     2546           
  Partials                       ?        0           

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