feat: add `fmt_icon()` method #2173

Job	Run time
test-pandas	45s
build (3.9)	1m 8s
test-windows	3m 50s
build (3.10)	1m 3s
build (3.11)	1m 7s
Test for saving table image with browser	2m 50s
build (3.12)	1m 22s
build (3.13)	1m 41s
Release to pypi	0s
	13m 46s

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