feat: add `fmt_icon()` method #2140

Job	Run time
Test for saving table image with browser	2m 54s
build (3.9)	1m 43s
build (3.10)	1m 20s
build (3.11)	1m 17s
test-pandas	41s
build (3.12)	1m 28s
test-windows	2m 35s
Release to pypi	0s
	11m 58s

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