Handle realWorldEvidence in login response payload

[robberwick]

This pull request introduces several enhancements and new features to the pylibrelinkup library, particularly focusing on the login model and its associated test cases. The most important changes include adding new models, introducing a field validator, and expanding the test coverage.

Enhancements to Models and Validation:

• src/pylibrelinkup/models/login.py: Added new classes HistoryItem and RealWorldEvidence to handle additional consent data. Updated the Consents class to include a new realWorldEvidence field.
• src/pylibrelinkup/models/login.py: Introduced a field_validator for the invitations field in the Data class to coerce null values to an empty list.

Error Handling:

• src/pylibrelinkup/pylibrelinkup.py: Improved error handling in the authenticate method by re-raising ValidationError before raising AuthenticationError.

Test Coverage:

• tests/data/realworldevidence_consent_response.json: Added a new JSON file to simulate a login response requiring real-world evidence consent.
• tests/test_client_authentication.py: Added a new test test_realworldevidence_consent_in_login_response to verify the handling of login responses that include real-world evidence consent requirements.

Fixes #53

[Copilot]

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