feat: add record timestamps to export

[jfcalvo]

Description

Only adding record's inserted_at and updated_at to the list of record attributes used with HubDatasetExport.

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested

• Changing the test suite for HubDatasetExporter.

Checklist

• I added relevant documentation
• I followed the style guidelines of this project
• I did a self-review of my code
• I made corresponding changes to the documentation
• I confirm My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I have added relevant notes to the CHANGELOG.md file (See https://keepachangelog.com/)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.10%. Comparing base (0924864) to head (edbb88d).
Report is 1 commits behind head on feat/export-dataset-to-hub-feature-branch.

Additional details and impacted files

@@                              Coverage Diff                              @@
##           feat/export-dataset-to-hub-feature-branch    #5754      +/-   ##
=============================================================================
- Coverage                                      92.12%   92.10%   -0.02%     
=============================================================================
  Files                                            161      161              
  Lines                                           6894     6894              
=============================================================================
- Hits                                            6351     6350       -1     
- Misses                                           543      544       +1     

Flag	Coverage Δ
argilla-server	92.10% <ø> (-0.02%)	⬇️

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