feat: add ADO.NET authentication parameter synonyms

[Copilot]

Adds support for ADO.NET-style authentication parameters to enable drop-in compatibility with Microsoft.Data.SqlClient connection strings.

Changes

• msdsn: Added authentication as synonym for fedauth parameter
• azuread: Added normalization for ADO.NET authentication method names (space-separated format)
  • Maps "Active Directory Default" → ActiveDirectoryDefault
  • Maps "Active Directory Password" → ActiveDirectoryPassword
  • Maps "Active Directory Service Principal" → ActiveDirectoryServicePrincipal
  • Maps "Active Directory Managed Identity" → ActiveDirectoryManagedIdentity
  • And 6 other ADO.NET authentication method names
  • "Sql Password" treated as non-Azure AD authentication (ignored)

Example

Both connection string formats now work identically:

// Original format (still supported)
db.Open("azuresql", "server=myserver;fedauth=ActiveDirectoryDefault")

// ADO.NET format (now supported)
db.Open("azuresql", "server=myserver;authentication=Active Directory Default")

Normalization ensures downstream code receives consistent internal format regardless of input variation.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add more ADO.Net synonyms to connection string parameters</issue_title>
<issue_description>

go-mssqldb/msdsn/conn_str.go

Line 649 in 8c35947

var adoSynonyms = map[string]string{

At minimum, add "Authentication" as a synonym for "fedauth".

Also, update the azuread package to support the same set of Authentication name values as ADO.Net in addition to the names it already supports as values for the fedauth parameter.

The name values ADO.NEt supports are:

 const string SqlPasswordString = "Sql Password";
        const string ActiveDirectoryPasswordString = "Active Directory Password";
        const string ActiveDirectoryIntegratedString = "Active Directory Integrated";
        const string ActiveDirectoryInteractiveString = "Active Directory Interactive";
        const string ActiveDirectoryServicePrincipalString = "Active Directory Service Principal";
        const string ActiveDirectoryDeviceCodeFlowString = "Active Directory Device Code Flow";
        internal const string ActiveDirectoryManagedIdentityString = "Active Directory Managed Identity";
        internal const string ActiveDirectoryMSIString = "Active Directory MSI";
        internal const string ActiveDirectoryDefaultString = "Active Directory Default";
        internal const string ActiveDirectoryWorkloadIdentityString = "Active Directory Workload Identity";
```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes Add more ADO.Net synonyms to connection string parameters #288

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