Implements brand_id parameter for IDV iframe session creation to enable custom branding.

Changes

• SdkConfig: Added optional brand_id parameter with property accessor and JSON serialization
• SdkConfigBuilder: Added with_brand_id() method for fluent configuration
• Tests: Added 4 test cases covering builder usage, defaults, and JSON serialization behavior

Usage

sdk_config = (
    SdkConfigBuilder()
    .with_allows_camera_and_upload()
    .with_brand_id("my-custom-brand")
    .with_success_url("https://example.com/success")
    .build()
)

The parameter is optional and excluded from JSON when not set, maintaining backward compatibility.

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