SNOW-955538: Multiple SAML Integrations Support

[sfc-gh-ext-simba-jl]

Description

Issue: https://github.com/snowflakedb/snowflake-sdks-drivers-issues-teamwork/issues/726

Checklist

• Code compiles correctly
• Run make fmt to fix inconsistent formats
• Run make lint to get lint errors and fix all of them
• Created tests which fail without the change (if possible)
• All tests passing
• Extended the README / documentation, if necessary

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (72af178) 82.79% compared to head (3092e5b) 83.12%.
Report is 2 commits behind head on master.

Files	Patch %	Lines
authexternalbrowser.go	78.57%	6 Missing ⚠️
async.go	93.33%	3 Missing ⚠️
dsn.go	85.71%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1025      +/-   ##
==========================================
+ Coverage   82.79%   83.12%   +0.33%     
==========================================
  Files          50       50              
  Lines        9718     9761      +43     
==========================================
+ Hits         8046     8114      +68     
+ Misses       1672     1647      -25     

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[sfc-gh-pfus]

Tests performed, similar to https://github.com/snowflakedb/snowflake-sdks-drivers-issues-teamwork/issues/580#issuecomment-1875240051:

Connect to the new SF (with multiple SAML support), regardless of disableConsoleLogin:

• redirects to the browser with a list with multiple SSO providers
• login completed successfully

Connect to the old SF (without multiple SAML support and single IdP defined):

when disableConsoleLogin not specified or disableConsoleLogin=true:

• redirects to single SSO provider defined in SF
• login completed successfully

when disableConsoleLogin=false:

• redirects to UI console
• not logged as expected