feat: stabilize Row class

[lars-reimann]

Closes partially #977

Summary of Changes

• Narrow types of parameters and results for better type checking.
• Improve tests and documentation.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	black	98	0	0	1.3s
✅ PYTHON	mypy	98		0	3.54s
✅ PYTHON	ruff	98	0	0	0.09s
✅ REPOSITORY	git_diff	yes		no	0.08s

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.00%. Comparing base (db85617) to head (faa7904).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #980   +/-   ##
=======================================
  Coverage   94.99%   95.00%           
=======================================
  Files         123      123           
  Lines        7696     7711   +15     
=======================================
+ Hits         7311     7326   +15     
  Misses        385      385           

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