SNOW-955536: Multiple SAML Integration

[sfc-gh-ext-simba-lf]

Description

Add multiple SAML Integration

Checklist

• Code compiles correctly
• Code is formatted according to Coding Conventions
• Created tests which fail without the change (if possible)
• All tests passing (dotnet test)
• Extended the README / documentation, if necessary
• Provide JIRA issue id (if possible) or GitHub issue id in PR name

[codecov]

Codecov Report

Attention: 47 lines in your changes are missing coverage. Please review.

Comparison is base (7d478f0) 83.93% compared to head (879728c) 83.73%.

Files	Patch %	Lines
...Core/Authenticator/ExternalBrowserAuthenticator.cs	0.00%	47 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #852      +/-   ##
==========================================
- Coverage   83.93%   83.73%   -0.21%     
==========================================
  Files          89       89              
  Lines        9313     9344      +31     
  Branches      859      861       +2     
==========================================
+ Hits         7817     7824       +7     
- Misses       1272     1296      +24     
  Partials      224      224              

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