Add suppressed_screens configuration support to SDK

[Copilot]

Implements suppressed_screens configuration field to enable shortening IDV flows by omitting specific screens.

Changes

• SDKConfig struct: Added SuppressedScreens []string field with omitempty JSON tag
• SdkConfigBuilder: Added WithSuppressedScreens(screens []string) builder method
• Build method: Refactored to use named field initialization and include suppressed screens
• Tests: Added example test case demonstrating JSON serialization

Usage

sdkConfig, _ := create.NewSdkConfigBuilder().
    WithAllowsCamera().
    WithSuppressedScreens([]string{"document_selection", "confirmation"}).
    Build()
// Serializes to: {"allowed_capture_methods":"CAMERA","suppressed_screens":["document_selection","confirmation"]}

The implementation maintains backward compatibility through omitempty tag—clients not using this feature see no change in JSON output.

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