Add enforce_handoff property to SDK session configuration

[Copilot]

Implements support for the enforce_handoff configuration property in IDV session creation, allowing relying parties to require handoff when it's enabled.

Changes

SdkConfig class (yoti_python_sdk/doc_scan/session/create/sdk_config.py):

• Added enforce_handoff optional boolean parameter
• Added with_enforce_handoff(flag) builder method
• Included property in JSON serialization

Tests (yoti_python_sdk/tests/doc_scan/session/create/test_sdk_config.py):

• Added test coverage for default behavior, true/false values, and JSON serialization
• Verified interaction with allow_handoff property

Usage

sdk_config = (
    SdkConfigBuilder()
    .with_allows_camera_and_upload()
    .with_allow_handoff(True)
    .with_enforce_handoff(True)  # New property
    .with_success_url("https://example.com/success")
    .build()
)

Validation

The API validates that enforce_handoff requires allow_handoff=true. Invalid configurations return errors handled via existing DocScanException mechanism.

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