create migrations for labeling_queue_data with spans

[dinmukhamedm]

[!IMPORTANT] Add span_id to labeling_queue_data and make target nullable in dataset_datapoints, updating migrations and schema definitions.

• Database Schema Changes:
  • Add span_id column to labeling_queue_data table in 0002_cold_romulus.sql.
  • Make target column in dataset_datapoints nullable in 0002_cold_romulus.sql.
• Migration Files:
  • Rename 0002_motionless_dragon_lord.sql to 0002_cold_romulus.sql.
  • Update 0002_snapshot.json and _journal.json to reflect new migration.
• Schema Definitions:
  • Update labelingQueueData and datasetDatapoints in schema.ts to match new schema.

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