SepWriter: Add NewRow overloads with CancellationToken

[nietras]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.65%. Comparing base (2ec75d9) to head (bfaa07f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #227   +/-   ##
=======================================
  Coverage   99.65%   99.65%           
=======================================
  Files          54       54           
  Lines        4051     4076   +25     
  Branches      457      458    +1     
=======================================
+ Hits         4037     4062   +25     
  Misses         11       11           
  Partials        3        3           

Flag	Coverage Δ
Debug	99.46% <100.00%> (+<0.01%)	⬆️
Release	99.82% <100.00%> (+<0.01%)	⬆️
macos-latest	93.05% <100.00%> (+0.04%)	⬆️
ubuntu-latest	99.60% <100.00%> (+<0.01%)	⬆️
windows-latest	99.60% <100.00%> (+<0.01%)	⬆️

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