Add name to {Chat|Json}InferenceDatapoint (database layer)

[shuyangli]

Adds backend type definitions and corresponding ClickHouse migration for an optional "name" to datapoints. Covers both Chat and Json datapoints.

This adds the type definition and any associated tests to both rust and typescript code. We will try to move all Clickhouse query logic from typescript to rust soon to try to better delineate the responsibilities for frontend logic.

A step towards #3653.

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Important

Add optional name field to Chat and Json inference datapoints, including database migration and updates to type definitions, code, and tests.

• Database Migration:
  • Adds name column to ChatInferenceDatapoint and JsonInferenceDatapoint tables in migration_0040.rs.
• Type Definitions:
  • Adds name field to ChatInferenceDatapoint and JsonInferenceDatapoint types in TypeScript and Rust.
• Code Updates:
  • Updates parseDatapointFormData() in route.tsx to handle name field.
  • Modifies getDatapoint() and insertDatapoint() in datasets.server.ts to include name.
  • Updates getEvaluationResults() and getEvaluationsForDatapoint() in evaluations.server.ts to handle name.
• Tests:
  • Adds name field to test cases in render_inferences.rs and clickhouse.rs.
  • Updates datasets.test.ts and evaluations.test.ts to include name in assertions.

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[shuyangli]

• Modify update_datapoint_handler to update the entire datapoint in-place #3794 : 2 dependent PRs (#3764 , #3795 )
• Add view-only UI for displaying datapoint names #3756
• Add name to {Chat|Json}InferenceDatapoint (database layer) #3735 👈 (View in Graphite)
• Extract business logic from UI routes for dataset page #3763
• Add a new reusable TableItemText component #3755
• main

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