Add input validation for field length constraints

[enaboapps]

Summary

• Add validate_log_payload() with all API constraint checks
• Add ValidationError class for clear error reporting
• Validates message, source, tags, userId, sessionId, requestId, version, dataset, flowId, errorName, errorStack, stepIndex
• 9 new validation tests

Closes #6

Test plan

• All 52 tests pass

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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/input-validation-6

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