ENH: adds columnwise fillna support#62393

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a18rhodes wants to merge 2 commits intopandas-dev:mainfrom

a18rhodes:fillna-colwise-4515

Commits on Sep 28, 2025

Addresses https://github.com/pandas-dev/pandas/issues/4514 - adds columnwise fillna.
a18rhodes
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update to use can_hold_element instead of naive exact dtype matching
a18rhodes
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