feat: add `fmt_icon()` method #2138

Job	Run time
Test for saving table image with browser	2m 59s
build (3.9)	1m 4s
test-pandas	43s
test-windows	3m 46s
build (3.10)	1m 12s
build (3.11)	1m 7s
build (3.12)	1m 12s
Release to pypi	0s
	12m 3s

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