feat: add `fmt_icon()` method #2149

Job	Run time
test-windows	3m 56s
test-pandas	41s
Test for saving table image with browser	2m 41s
build (3.9)	1m 4s
build (3.10)	1m 11s
build (3.11)	1m 1s
build (3.12)	1m 39s
build (3.13)	1m 22s
Release to pypi	0s
	13m 35s

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