Add suppressed_screens configuration support for IDV shortened flow

[Copilot]

Implements SDK-side support for the suppressed_screens configuration parameter, enabling IDV flow screen suppression for shortened user experiences.

Changes

• SdkConfig: Added SuppressedScreens property with JSON serialization as suppressed_screens
• SdkConfigBuilder:
  • WithSuppressedScreen(string) - adds individual screens, prevents duplicates
  • WithSuppressedScreens(List<string>) - replaces entire list
• Tests: 8 unit tests covering single/multiple screens, duplicates, replacement behavior, null handling

Usage

var sdkConfig = new SdkConfigBuilder()
    .WithLocale("en")
    .WithSuccessUrl("https://example.com/success")
    .WithSuppressedScreen("intro")
    .WithSuppressedScreen("privacy_policy")
    .Build();

Serializes to:

{
  "locale": "en",
  "success_url": "https://example.com/success",
  "suppressed_screens": ["intro", "privacy_policy"]
}

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