Add capture_type property to StaticLivenessResourceResponse

[Copilot]

Exposes the capture_type field from Static Liveness resources when fetching session data.

Changes

• StaticLivenessResourceResponse: Added CaptureType property with JSON mapping to capture_type
• Tests: Added deserialization test and Static liveness type test case

Usage

// When deserializing session data with static liveness resources
GetSessionResult result = JsonConvert.DeserializeObject<GetSessionResult>(json);
var staticLiveness = result.Resources.LivenessCapture.Single() as StaticLivenessResourceResponse;

// capture_type is now accessible
string captureType = staticLiveness.CaptureType;  // e.g., "SELFIE"

The property follows existing patterns in the codebase and maintains backward compatibility as an optional field.

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