feat: add dataset api

[galzilber]

[!IMPORTANT] Introduces a comprehensive dataset management API to the SDK, including dataset creation, updating, deletion, versioning, and extensive testing.

• Behavior:
  • Adds dataset management API with create, list, find, update, delete, and publish functionalities in base-dataset.ts, dataset.ts, and datasets.ts.
  • Supports column and row management, CSV import, and versioning.
  • Responses are camelCase-normalized using response-transformer.ts.
• SDK Changes:
  • Exposes dataset management via TraceloopClient in traceloop-client.ts.
  • Adds Datasets, Dataset, Column, and Row classes for dataset operations.
• Tests:
  • Comprehensive end-to-end tests in datasets-comprehensive.test.ts and datasets-final.test.ts.
  • Tests cover dataset creation, column and row operations, CSV import, and error handling.

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Summary by CodeRabbit

• New Features

  • Full dataset management in the SDK: create/list/find/update/delete/publish datasets; manage columns & rows; CSV import, stats, versioning, and camelCase-normalized responses. SDK exposes a public datasets API and accepts an optional projectId.

• New Scripts / Sample App

  • Sample app demonstrating dataset lifecycle and a test script; npm commands added to build & run these demos/tests.

• Tests

  • Added comprehensive end-to-end Dataset API test suites and recorded HTTP sessions.