feat: add ADO.Net Authentication connection string synonym and spaced value names

[dlevy-msft-sql]

Problem

Users coming from ADO.Net expect to use Authentication=Active Directory Default style connection strings, but the driver only supports fedauth=ActiveDirectoryDefault.

Fix

1. Connection string synonym

Added "authentication" as a synonym for "fedauth" in the ADO-style connection string parser (msdsn/conn_str.go).

2. ADO.Net-style value names

Added support for spaced authentication values in the azuread package, matching ADO.Net SqlClient names:

ADO.Net Value	Maps To
Sql Password	Standard SQL auth (no fedauth)
Active Directory Password	ActiveDirectoryPassword
Active Directory Integrated	ActiveDirectoryIntegrated
Active Directory Interactive	ActiveDirectoryInteractive
Active Directory Service Principal	ActiveDirectoryServicePrincipal
Active Directory Device Code Flow	ActiveDirectoryDeviceCode
Active Directory Managed Identity	ActiveDirectoryManagedIdentity
Active Directory MSI	ActiveDirectoryMSI
Active Directory Default	ActiveDirectoryDefault
Active Directory Workload Identity	ActiveDirectoryWorkloadIdentity

Examples

These connection strings are now equivalent:

fedauth=ActiveDirectoryDefault
Authentication=ActiveDirectoryDefault
Authentication=Active Directory Default

Tests

Added 4 test cases to TestValidateParameters:

• Authentication synonym with existing value name
• Active Directory Password spaced name
• Active Directory Managed Identity spaced name
• Sql Password returns no fedauth config

All existing tests pass.

Fixes #288

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.60%. Comparing base (c10fa99) to head (cf4e65d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #368       +/-   ##
===========================================
+ Coverage   80.66%   96.60%   +15.93%     
===========================================
  Files          35       92       +57     
  Lines        6842    74355    +67513     
===========================================
+ Hits         5519    71828    +66309     
- Misses       1055     2191     +1136     
- Partials      268      336       +68     

Flag	Coverage Δ
unittests	96.53% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
azuread/configuration.go	52.34% <100.00%> (ø)
msdsn/conn_str.go	90.08% <ø> (ø)

... and 57 files with indirect coverage changes

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[Copilot]

Pull request overview

Adds ADO.Net-compatible authentication naming to the Go MSSQL driver’s connection-string handling, improving migration ergonomics for users coming from Microsoft.Data.SqlClient.

Changes:

• Add Authentication as an ADO-style keyword synonym for fedauth in msdsn parsing.
• Normalize ADO.Net “spaced” authentication method values (e.g., Active Directory Default) to the driver’s existing ActiveDirectoryDefault-style values in azuread.
• Extend azuread unit tests to cover the new synonym and spaced value mappings (including Sql Password meaning “no fedauth”).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
msdsn/conn_str.go	Adds authentication -> fedauth keyword synonym in ADO-style DSN parsing.
azuread/configuration.go	Adds mapping table + normalization step for ADO.Net spaced Authentication values.
azuread/configuration_test.go	Adds test cases validating synonym + spaced value support, including Sql Password behavior.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.