feat: add `fmt_icon()` method #2172

Job	Run time
build (3.9)	1m 5s
test-pandas	52s
build (3.10)	1m 19s
test-windows	4m 24s
build (3.11)	1m 7s
build (3.12)	1m 14s
Test for saving table image with browser	2m 55s
build (3.13)	1m 17s
Release to pypi	0s
	14m 13s

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