store evals in flattened table

[dinmukhamedm]

[!IMPORTANT] Introduce a new evaluation_scores table to store evaluation scores in a flattened format, updating related database schema, API endpoints, and data processing logic.

• Database Changes:
  • Create new evaluation_scores table in 0001_reflective_nuke.sql for storing scores in a flattened format.
  • Remove score_names and average_scores columns from evaluations table.
  • Update evaluation_results table to make scores column nullable.
• API Changes:
  • Update create_evaluation in evaluations.rs to handle new score storage.
  • Modify set_evaluation_results in db/evaluations.rs to insert scores into evaluation_scores.
  • Adjust get_evaluation_results to join with evaluation_scores.
• Code Refactoring:
  • Add EvaluationScore struct and related functions in evaluation_scores.rs.
  • Update relations in relations.ts to include evaluationScores.
• Miscellaneous:
  • Update schema.ts to reflect new database schema changes.
  • Add new relations for evaluationScores in relations.ts.

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