feat: add `fmt_icon()` method #2176

Job	Run time
test-pandas	45s
build (3.9)	1m 21s
Test for saving table image with browser	2m 24s
build (3.10)	1m 17s
test-windows	3m 47s
build (3.11)	1m 2s
build (3.12)	1m 13s
build (3.13)	1m 23s
Release to pypi	0s
	13m 12s

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