feat: add `fmt_icon()` method #2135

Job	Run time
Test for saving table image with browser	8m 2s
build (3.9)	1m 6s
test-windows	4m 32s
build (3.10)	1m 3s
test-pandas	43s
build (3.11)	1m 32s
build (3.12)	1m 11s
Release to pypi	0s
	18m 9s

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