Miscellaneous improvements for 2026-W03

[khaeru]

• Add new CLI command tdc check-record.
  This command retrieves the metadata for a given record from the TDC CKAN API and checks/prints some properties of the record. For example:

  $ tdc check-record registered-vehicles-in-tanzania
  - https://portal.transport-data.org/@ministry of works and transport of tanzania/registered-vehicles-in-tanzania
  - Title: 'Registered Vehicles in Tanzania'
  - Category: tdc_formatted
  
  - Number of files by extension: 1 .csv, 2 .pdf, 1 .xlsx
  - Number of data files: 2
  - Number of possible SDMX-CSV files: 1
  
  Criteria for a TDC Formatted record:
  - At least one file in CSV format: True
  - Correct category assigned: True
  - CSV file(s) are in SDMX-CSV format (not implemented yet): True
  - Overall: YES
  
  Criteria for a TDC Harmonized record—all of the above, plus:
  - Correct category assigned: False
  - Overall: NO

  • Retrieve and cache the data file(s).
  • Check the contents of data file(s).

• Filter/ignore the warning due to Replace pkg_resources with importlib.metadata ckan/ckanapi#218. The upstream PR was merged, but the package has not been released since 2024, so the warning still appears.

How to review

• Try running tdc check-record for some known record IDs.
  • Report whether the outputs appear correct.

PR checklist

• Checks all ✅
• Update documentation
• Update doc/whatsnew.rst