[konstntokas]

Add docs for extend_dataset and mosaic_datasets. related to #38

Checklist:

• Add unit tests and/or doctests in docstrings
• Add docstrings and API docs for any new/modified user-facing classes and functions
• New/modified features documented in docs/
• Changes documented in CHANGES.md
• CI checks pass
• Test coverage remains or increases (target 100%)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.25%. Comparing base (a1d7f22) to head (ba58373).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #39   +/-   ##
=======================================
  Coverage   99.25%   99.25%           
=======================================
  Files          22       22           
  Lines        2271     2271           
=======================================
  Hits         2254     2254           
  Misses         17       17           

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