Enable callback to negotiate NTLM or Kerberos

[twsouthwick]

No description provided.

[Wraith2]

use curly braces for clarity rather than implicily scoped using.

[codecov]

Codecov Report

Attention: 30 lines in your changes are missing coverage. Please review.

Comparison is base (416afcd) 72.45% compared to head (03e5581) 76.67%.
Report is 2 commits behind head on main.

❗ Current head 03e5581 differs from pull request most recent head 714bf3f. Consider uploading reports for the commit 714bf3f to get more accurate results

Files	Patch %	Lines
...ent/src/Microsoft/Data/SqlClient/TdsParser.SSPI.cs	0.00%	19 Missing ⚠️
.../netcore/src/Microsoft/Data/SqlClient/TdsParser.cs	40.00%	6 Missing ⚠️
...core/src/Microsoft/Data/SqlClient/SqlConnection.cs	33.33%	4 Missing ⚠️
...c/Microsoft/Data/SqlClient/SqlConnectionPoolKey.cs	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2248      +/-   ##
==========================================
+ Coverage   72.45%   76.67%   +4.21%     
==========================================
  Files         309      247      -62     
  Lines       61960    38819   -23141     
==========================================
- Hits        44895    29764   -15131     
+ Misses      17065     9055    -8010     

Flag	Coverage Δ
addons	92.88% <ø> (ø)
netcore	76.54% <40.00%> (-0.16%)	⬇️
netfx	?

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[twsouthwick]

Thanks @Wraith2 for the comments - I expect this PR to change drastically before I'm fully ready for review. I'm planning on using this to generate the builds so I can have some customers I'm working with try it out for their use cases to verify things

[twsouthwick]

Closing for now until decisions are made in #2253