feat(auth): Add support for windows grant type.

[spbsoluble]

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[Copilot]

Pull request overview

This pull request adds support for Integrated Windows Authentication (IWA) by introducing a new windows grant type to the Delinea Secret Server PAM Provider.

Key changes:

• Added windows as a third supported grant type alongside password and client_credentials
• Implemented Windows authentication flow using default credentials via HttpClientHandler
• Updated validation logic to support Windows authentication without requiring explicit credentials
• Enhanced error handling with specific Windows authentication exceptions

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
CHANGELOG.md	Added changelog entry documenting the new Windows grant type feature
README.md	Added comprehensive documentation with example configuration for Windows authentication
docsource/overview.md	Added authentication methods section with Windows grant type examples
delinea-secretserver-pam/manifest.json	Updated GrantType to include windows option
delinea-secretserver-pam/SecretServerPam.cs	Core implementation of Windows authentication flow with specialized URL path, error handling, and HttpClient configuration
delinea-secretserver-pam/Models/DelineaConfiguration.cs	Updated validation logic to handle Windows grant type with proper credential requirements
TestConsole/Program.cs	Added case handling for windows grant type in test console

Comments suppressed due to low confidence (1)

delinea-secretserver-pam/SecretServerPam.cs:418

• The error message contains an inconsistency. It mentions only 'password' and 'client_credentials' but should also include 'windows' as a supported grant type to be accurate with the current implementation.

                    Logger.LogError(
                        "Invalid grant type '{GrantType}' specified. Supported types are 'password' and 'client_credentials'",
                        grantType);

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