feat: add `fmt_icon()` method #2137

Job	Run time
test-windows	2m 36s
Test for saving table image with browser	2m 27s
test-pandas	41s
build (3.9)	1m 4s
build (3.10)	59s
build (3.11)	1m 4s
build (3.12)	1m 20s
Release to pypi	0s
	10m 11s

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