Summary by cubic

Removed the redundant logfire.experimental.datasets package that only re-exported api_client symbols, and deleted its re-export tests. This cleans up duplicate import paths without changing client behavior.

• Migration
  • Replace imports from logfire.experimental.datasets with logfire.experimental.api_client.
  • Use LogfireAPIClient, AsyncLogfireAPIClient, DatasetNotFoundError, CaseNotFoundError, and DatasetApiError from api_client.

^{Written for commit e7a1962. Summary will update on new commits.}