Expand test coverage

[enaboapps]

Summary

• Expand from 6 to 38 tests covering all SDK features
• Add mockito dev dependency for HTTP mock testing
• Add base_url config option for test server targeting
• Test categories: validation (all fields), batch flush, manual flush, disconnect, retry, on_error callback, ingest_raw, serialization, config defaults, log level ordering, convenience methods
• Update basic example to use ..Default::default()

Closes #6

Test plan

• All 38 tests pass (cargo test)

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/test-coverage-6

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