query table evaluation_results with timestamp

[dinmukhamedm]

[!IMPORTANT] Update evaluation score handling by renaming table and adding timestamp serialization in evaluation_scores.rs and route.ts.

• Database Changes:
  • Change table name from old_evaluation_scores to evaluation_scores in evaluation_scores.rs and route.ts.
  • Add serialize_timestamp function in evaluation_scores.rs to serialize timestamp as nanoseconds.
• Functionality:
  • Update insert_evaluation_scores, get_average_evaluation_score, get_evaluation_score_buckets_based_on_bounds, and get_global_evaluation_scores_bounds to use evaluation_scores table.
  • Modify POST function in route.ts to insert into evaluation_scores with nanosecond timestamp.

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